13 December, 2012

Review: M 33 in Andromeda

M 33 in Andromeda M 33 in Andromeda by A.E. van Vogt
My rating: 3 of 5 stars

This is a great collection of soft science fiction stories from a classic author. Well worth the read, though none of the stories in this collection jumped out at me as being particularly worthy of praise. Good consistent quality stories like this rare to find, so even though none of these are on my favorites list, I'm still glad that I took the time to read this book.

View all my reviews

06 December, 2012

Really Big Numbers

EDIT: Portions of this article when first published were factually inaccurate. These errors have since been corrected using strikethrough text. A 2018 follow-up post is also available.

Occasionally, when I'm talking to younger people and they find out that I'm mathematically literate, I'll get a question of the form: "What's the biggest number you can name?"

It's a somewhat difficult question to answer, because it really depends on what counts as naming and what counts as a number. After all, am I allowed to use a function to identify a number? Does the number have to be finite? Must it be useful in some sense? Should I include transfinite numbers? Or do they just want the highest number that has a common english name?

Since there are different answers depending on what the questioner thinks is acceptable, I'll try to list a few of the standard answers I give to these younger questioners here, starting from the smallest and work my way up. If I've missed any natural answers to the question, please comment with your suggestion, so I can add it to my repertoire.

Common English Names


The first few counting numbers have names that we commonly use in English, e.g., ten, hundred, thousand, million, billion, trillion, quadrillion, quintillion, sextillion, septillion, octillion, nonillion, &c. Some of these get obscure, but they're nevertheless understandable. One of the largest of these in fact has a famous search engine named after it: a googol is equivalent to 10^100. Google's headquarters is also named after an even larger such number; the Googleplex near San Jose, California, is named after the googolplex, which is 10^(googol). In between these two values is the centillion at 10^303, which is about as large as you can get while using the "-illion" suffix. (You can artificially construct larger terms, like the uncentillion, but this is just a matter of inserting additional prefixes.)

Of note here should be Archimedes' system of estimating the number of grains of sand that could fill the universe at 10^63 by using a unit called the myriad, which is equal to 10,000. Archimedes did this by calling a myriad of myriads the first unit, and then taking a myriad myriad of myriad myriad units to create the second unit, and so on for eight times, saying this would be sufficient to fill the universe with grains of sand.

Mathematical Notation


Of course, there are many numbers that are much larger than these, but they generally do not have common english names. Rather, we write them out using scientific notation or by some other mathematical notation. The googolplex above is only 10^(10^100); if you want something bigger, you need only write out another exponent. But even if you repeatedly take exponents of exponents all day long, you won't get anywhere near where you can get if you instead use a more efficient notation system.

Mathematical operations build upon themselves recursively, as any schoolchild learns when they begin to see the relationship between addition and multiplication. Exponentiation is the next logical step after multiplication, but there are further steps one can take. The next method up is called tetration, and it involves repeated exponentiation.

The addition of A+N is when you take the number A and succeed it N times. The multiplication of A*N (or A×N) is when you take A and add it to itself N times. The exponentiation of A^N (or AN) is when you take A and multiple it to itself N times. The tetration of NA is when you take A and exponentiate it by itself N times. I'm sure you can see the pattern here.

NA is A^A^…^A^A where there are N As in the sequence. This results is very large numbers. 10010 is much bigger than 10100, for example. But some notations go far beyond mere tetration.

One such way of notating large numbers is by using Knuth's up-arrow notation. Rather than use superscript, up arrows are used to indicate which type of operation is being used. Exponentiation is written out as A^N (or A↑N) instead of AN. Tetration is written as A^^N (or A⇈N or A↑2N) instead of NA. And the next step in the series follows the same rule: pentation is written as A^^^N (or A↑↑↑N or A↑3N), which is just taking A and tetrating it N times. Similarly, hexation is A^^^^N (or A⇈⇈N or A↑4N), which is taking A and pentating it N times. And so on.

It is perhaps a little difficult to fully understand the scale of these numbers. Even the innocuous looking 3^^^3 is much, much, much bigger than a googolplex:


Add another arrow or two in there and the number becomes so large that trying to just think about it boggles the mind. Usually, when I want to name a very large finite number, I will go with 3^^^^3. It's far bigger than almost anything that we deal with in reality, and so effectively works as a stand in for "extraordinarily large finite number".

However, it's not even close to the biggest that some mathematicians work with.

Graham's number refers to the number of dimensions a hypercube must have in order to satisfy some esoteric conditions in Ramsey theory. The number is so large that the number of up-arrows you'd need to display it is itself amazingly huge. Here's a lower bound of Graham's number: Here's one upper bound of Graham's number that isn't even the lowest known upper bound:



In the above equation, notice that the number of up arrows in the first line is indicated by the number in the line below it. My "extraordinarily large finite number" that I commonly use, 3^^^^3, is merely the number of up arrows used in the sequence directly above it. As you can see, Graham's number is huge.

Fast Growing Functions


And yet, Graham's number is not nearly as big as some. If functions are allowable in our answer, then much bigger numbers can be shown in a small amount of space. Unfortunately, many people seem to think that saying f(x) where the function is defined as X+1 is not the same thing as naming a number. If I say f(3), we all know that what I'm pointing at is 4, but perhaps we might say that I only pointed at it and yet did not name it. However, there is philosophical debate on this issue; after all, what more is there to naming than pointing out which thing we mean? In a very real sense, f(3) can be said to be yet another name for the number 4 here. If you agree with this logic, then we can easily construct much bigger numbers than even Graham's number by merely using functions that grow much faster than even nested up arrow notation can handle.


Take the busy beaver function. It refers to the maximum number of steps performed by turing machines of a certain class, and has been mathematically proven to grow faster than any computable function, though there might non-computable functions that grow even faster. It starts out slow, with Σ(12) being only 3^^^^3, the bottom line of Graham's number. But it grows fast, where Σ(2k) > 3k-23 > A(k-2,k-2) (k≥2), and A() is Ackermann's function: A(m,n)=2↑m-2(n+3)-3.

But if you think the busy beaver function grows quickly, then consider the TREE(x) function. It was created to deal with trees in set theory and grows much faster than most people can appreciate. TREE(3)=A(A(...A(1)...)), where the number of As is A(187196), and A(x) is a version of Ackermann's function: A(x) = 2↑x-1x. Compare to Graham's number, which is just A64(4) — a much smaller number than the established lower bound of TREE(3) at AA(187196)(1). If you want to a compact way of pointing out an absurdly large finite number, consider using TREE(100). The only way I know of to reliably get higher ordinals is to put in bigger numbers inside the function, and god help you if you start iterating the function inside itself.


Take the TREE(x) function. It was created to deal with trees in set theory and grows much faster than most people can appreciate. TREE(3)=A(A(...A(1)...)), where the number of As is A(187196), and A(x) is a version of Ackermann's function: A(x) = 2↑x-1x. Compare to Graham's number, which is just A64(4) — a much smaller number than the established lower bound of TREE(3) at AA(187196)(1). If you want to a compact way of pointing out an absurdly large finite number, consider using TREE(100).

But if you think the TREE() function grows quickly, then consider the busy beaver function. It refers to the maximum number of steps performed by turing machines of a certain class, and has been mathematically proven to grow faster than any computable function, though there might non-computable functions that grow even faster. It starts out slow, with Σ(12) being only 3^^^^3, the bottom line of Graham's number. But it grows fast, where Σ(2k) is


and A() is Ackermann's function: A(m,n)=2↑m-2(n+3)-3. The only way I know of to reliably get higher ordinals is to put in bigger numbers inside the function, and god help you if you start iterating the function inside itself.

Edit: This section was originally inverted, and incorrectly portrayed the TREE() function as faster growing than the Busy Beaver function.

Infinity and Beyond


Of course, all the above numbers are finite, so there is at least one number that beats them all: ∞. Yet the infinity that most people think of when they imagine "the infinite" is merely א0, the first and lowest transfinite cardinal number. These are countably infinite sets, like the set of all positive integers. Yet this comparatively small infinity dwarfs in comparison to א1, the uncountable set which might correspond to the cardinality of real numbers. (This the continuum hypothesis, and it only works if 2^(א0)=א1, which is far from clear.)

But cardinality is not the only kind of infinity; there are also ordinal infinities. The lowest transfinite ordinal number is ω, which corresponds to the order type of the natural numbers. We can then consider the אa where a=ω. This makes אω, which is the lowest uncountable cardinal number that is not the same as the cardinality of the real numbers. the smallest uncountable cardinal provably in ZFC that is not the cardinality of ℜ. (The cardinality of the real numbers might be א1, which is smaller, or אω+1, which is bigger (or many other cardinals).) Don't worry if this is starting to make you dizzy; it does the same to me, too.

However, this is just the low end of the scale. At the high end, things really get deep. Dedekind looked at the system of all ordinal numbers, calling it Ω. Wondering if he could get even higher, he proposed the sequence:

{0, 1, 2, 3, … ω0, ω0+1, …, γ, …}

where each γ in the sequence goes on to describe the order type of all preceding elements. But this turns out to be inconsistent, since if it were consistent, then there would be some number that corresponds to its order, and that number would have to be higher than any of the numbers in the above sequence. But since this is a number, it must be in Ω to begin with, since Ω has all numbers in it. But a number cannot be greater than itself, and so this new proposed set by Dedekind cannot exist. This means that Ω is definitely the absolute infinity of its class.

Does this mean that Ω is the winner here? Can we get any bigger? The answer, once again, is it depends. Woodin's Ultimate L, LΩ, is the ultimate enlargement of Gödel's constructible universe L, which is itself the proper class of all constructible pure sets. Here, L refers to the standard inner model universe of the inner model theory ZFC+V=L, where ZFC is Zermelo-Fraenkel set theory and V is the Von Neumann Universe stationary club (closed unbounded class) of all well-founded pure sets.

That's a mouthful, but does it mean that is LΩ "higher" than Ω? I don't know that it even makes much sense to ask the question, because they're talking about different things. Yet they're both "numbers", so maybe that means they can be compared anyway? To be honest, I'm not entirely sure. When it comes to infinities any bigger than א0, my brain implodes. The previous paragraph, in fact, was written with only a vague understanding of what I've read elsewhere — it's more regurgitation than true understanding on my part.

Conclusion


After all this, I suppose the biggest entity I feel comfortable talking about is Ω, especially when it comes to trying to answer unexpected questions from younger people. Concepts like Hausdorff's absolute continuum cΩ or Woodin's Ultimate LΩ describe situations that may or may not correspond to אω or Ω or whatever. For all I know, everything from אω and up are all equivalently large entities. At some point I may bother trying to understand this stuff more in depth, but until then I think I'll just stick with the large finite numbers and Ω if they want to know how big ∞ can truly get.

EDIT: A few mathematicians expressed concern that some of the mathematical sentences I originally presented in this essay were factually incorrect. These errors have since been corrected, and previous text has been left in using strikethrough text to illustrate the errors I originally ran into as a layperson attempting to write a mathematical article. Thank you to professor Edgar Bering and grad students Bo Waggoner and Charlie Cunningham for finding and correcting my errors.

27 November, 2012

Review: Tangents

Tangents Tangents by Greg Bear
My rating: 4 of 5 stars

This collection of short stories from the early portion of Greg Bear's career includes several hits alongside a few misses in both hard and soft science fiction. There's even a nonfiction article on the state of technology included in the volume that really dates the book.

Overall, it's a worthwhile read and has more than a few interesting themes, and is definitely good enough for me to consider it above average. Nevertheless, I hesitate to completely recommend it, as it does not (in my opinion) include Bear's best work, which is generally longer form scifi. Still, if you want to read a few good short stories, many of those you'll find in this volume will truly make you think.

View all my reviews

15 November, 2012

Ghostwriting

Ghostwriting for companies, organizations, and people that you don't really believe in is soul-wrenching work. Some of the things I've done for money recently are pieces that I am not at all happy about writing.

When I left as webmaster of one national nonprofit in particular (while it's easy to use Google to find out which, I'll leave them unnamed here for reasons that will become explicit), I had very specific ideas on the kinds of things I wanted to do. I never liked how that organization would use misleading language on the severity of child hunger in America (food insecurity for one day in a year should be prevented, but to call the 1 in 5 statistic for this a "hunger" statistic seems disingenuous to me), and the sheer amount of money it spent on getting high profile celebrities to represent the brand utterly floored me. I was completely flabbergasted when I first saw just how much of people's donations were going toward paying for obscure extravagancies that celebrities insisted on. Yet it's hard to fault them for this behavior, since the celebrities did bring in additional donations that more than made up for the thousands spent on keeping whiny celebs happy. If what matters is getting the most money to spend on the cause, then I suppose they were justified in wasting money on severely overpriced hotel rooms and other shockingly "wasteful" expenditures that celebrities insisted on, such as additional empty hotel rooms next door to theirs. I put "wasteful" here in quotes because, in the end, the organization raised money by catering to such asshole celebrities. So, in a way, these "wasteful" costs were worthwhile. But the fact that these celebrities insisted on spending a child hunger charity's money in this way really made me feel uneasy.

As a consequentialist-style revisionist, I really do feel that outcomes are what matters in the end. So it's hard for me to fault this organization's practices. Their mission is well intentioned, and they do a very good job of raising money for it, but it always felt so slimy when I had to write cop on their website or in their newsletters about the issue of child hunger in America. Every time I made it seem like the issue was more severe than it actually is, I cringed inside. And yet I performed this function for years, drafting language that would best turn into donations instead of language that would best reflect the truth.

After I left, I desperately wanted to work in optimal philanthropy community. I figured I could accomplish some real good if I at least worked in a field that was smart about how it allocated funds. But the job market is tough, and instead I've been ghostwriting ever since. Ironically, I seem to be writing for sleazier and sleazier groups all the time. Maybe it's because I'm good at it, but I suppose it's more likely that I'm just not trying hard enough to do what I really want to do.

[Edit from October 2015: I later came to the field of Effective Altruism mostly due to the negativity experienced at traditional nonprofits discussed in this entry.]

11 November, 2012

My Philosophical Positions

As promised in a previous entry, I have decided to make my answers to the 2009 PhilPapers Survey public on my blog. These answers were previously made public in a LessWrong poll, but in the interest of making my specific positions easy to read, I've compiled them all here. Note that this post is intended solely to give my position on each of these issues, and does not currently have commentary on why I feel as I do. However, in future entries I intend to zero in on each issue; as I do so, I plan to link to those entries from these position statements in order to more explicitly share why I hold these particular philosophical positions.

My answers are given in bold. The distribution of answers from the 2009 PhilPapers survey is given as a percentage after each answer. Note that percentages for "accept" and "lean toward" are combined here, although more finely grained results are available on the PhilPapers site. A short explanation (thanks to pragmatist & PhilPapers' clarifications for help) of each question is provided for any readers that are not well versed in these issues. Links to future blog posts on why I hold each position will be made available as I write them. Links to relevant SEP articles are provided.

The 2009 PhilPapers Survey



A priori knowledge: yes or no?
  • Accept: yes (71.1%)
  • Lean toward: yes
  • Accept: no (18.4%)
  • Lean toward: no
  • Other (10.5%)
Yes: There exist facts we can know without our knowledge being based on sensory experience.
No: Justification of knowledge requires sensory experience.


Abstract objects: nominalism or Platonism?
  • Accept: nominalism (37.7%)
  • Lean toward: nominalism
  • Accept: Platonism (39.3%)
  • Lean toward: Platonism
  • Other (23.0%)
Abstract objects are objects that do not correspond to any pattern of matter/energy in space-time.
Nominalism: Abstract objects do not exist.
Platonism: Abstract objects exist.


Aesthetic value: objective or subjective?
  • Accept: objective (41.0%)
  • Lean toward: objective
  • Accept: subjective (34.5%)
  • Lean toward: subjective
  • Other (24.5%)

Analytic-synthetic distinction: yes or no?
  • Accept: yes (64.9%)
  • Lean toward: yes
  • Accept: no (27.1%)
  • Lean toward: no
  • Other (8.1%)
Yes: Some sentences are true solely due to the meanings of the words.
No: Every sentence is open to empirical falsification or no sentence is open to falsification.


Epistemic justification: internalism or externalism?
  • Accept: internalism (26.4%)
  • Lean toward: internalism
  • Accept: externalism (42.7%)
  • Lean toward: externalism
  • Other (30.8%)
Externalism: Belief can be justified even when the justification os not consciously available to the subject.
Internalism: Belief is only justified if there is conscious understanding of the justification.


External world: idealism, skepticism, or non-skeptical realism?
  • Accept: idealism (4.3%)
  • Lean toward: idealism
  • Accept: skepticism (4.8%)
  • Lean toward: skepticism
  • Accept: non-skeptical realism (81.6%)
  • Lean toward: non-skeptical realism
  • Other (9.2%)
Idealism: Reality is not mind-independent.
Skepticism: Mind-independent reality exists, but we lack epistemic access to it.
Non-skeptical realism: Mind-independent reality exists, and we have epistemic access to its structure.


Free will: compatibilism, libertarianism, or no free will?
  • Accept: compatibilism (59.1%)
  • Lean toward: compatibilism
  • Accept: libertarianism (13.7%)
  • Lean toward: libertarianism
  • Accept: no free will (12.2%)
  • Lean toward: no free will
  • Other (14.9%)
Compatibilism: We can have free will in a deterministic universe.
Libertarianism: Incompatibilism is true and we have free will.
No free will: Free will does not exist.


God: theism or atheism?
  • Accept: theism (14.6%)
  • Lean toward: theism
  • Accept: atheism (72.8%)
  • Lean toward: atheism
  • Other (12.6%)
Theism: Gods exist.
Atheism: Gods do not exist.


Knowledge: empiricism or rationalism?
  • Accept: empiricism (35.0%)
  • Lean toward: empiricism
  • Accept: rationalism (27.8%)
  • Lean toward: rationalism
  • Other (37.2%)
Empiricism: Only sensory experience gives us new information.
Rationalism: Some information exists that we can arrive at without sensory experience.


Knowledge claimscontextualismrelativism, or invariantism?
  • Accept: contextualism (40.1%)
  • Lean toward: contextualism
  • Accept: relativism (2.9%)
  • Lean toward: relativism
  • Accept: invariantism (31.1%)
  • Lean toward: invariantism
  • Other (25.9%)
Contextualism: The truth of a knowledge claim depends on the context in which it is uttered.
Relativism: Whether a subject possesses knowledge of a proposition is relative to a set of epistemic standards.
Invariantism: The truth of knowledge claims does not depend on context and is not relativized to epistemic standards.


Laws of nature: Humeanism or non-Humeanism?
  • Accept: Humeanism (24.7%)
  • Lean toward: Humeanism
  • Accept: non-Humeanism (57.1%)
  • Lean toward: non-Humeanism
  • Other (18.2%)
Humeanism: The laws of nature are compressed descriptions of salient patterns in the distribution of physical events.
Non-Humeanism: The laws of nature are not mere descriptions, but actually determine the distribution of physical events.


Logic: classical or non-classical?
  • Accept: classical (51.6%)
  • Lean toward: classical
  • Accept: non-classical (15.4%)
  • Lean toward: non-classical
  • Other (33.1%)
Classical: Standard logics, such as Boolean logic or first-order predicate calculus, are best (or correct).
Non-classical: The best logic is not classical (e.g., paraconsistent logic).


Mental content: externalism or internalism?
  • Accept: externalism (51.1%)
  • Lean toward: externalism
  • Accept: internalism (20.0%)
  • Lean toward: internalism
  • Other (28.9%)
Externalism: The representational content of our mental states is dependent upon properties of our external environment.
Internalism: The representational content of our mental states is fixed by our brain state.


Meta-ethics: moral realism or moral anti-realism?
  • Accept: moral realism (56.4%)
  • Lean toward: moral realism
  • Accept: moral anti-realism (27.7%)
  • Lean toward: moral anti-realism
  • Other (15.9%)
Moral realism: Objective moral facts exist.
Moral anti-realism: Objective moral facts do not exist.


Metaphilosophy: naturalism or non-naturalism?
  • Accept: naturalism (49.8%)
  • Lean toward: naturalism
  • Accept: non-naturalism (25.9%)
  • Lean toward: non-naturalism
  • Other (24.3%)
Naturalism: All causes are natural.
Non-naturalism: Supernatural causes exist.


Mind: non-physicalism or physicalism?
  • Accept: non-physicalism (27.1%)
  • Lean toward: non-physicalism
  • Accept: physicalism (56.5%)
  • Lean toward: physicalism
  • Other (16.4%)
Physicalism: A physical duplicate of our world must necessarily also be a mental duplicate.
Non-physicalism: Mental states are not dependent on physical states.


Moral judgment: cognitivism or non-cognitivism?
  • Accept: cognitivism (65.7%)
  • Lean toward: cognitivism
  • Accept: non-cognitivism (17.0%)
  • Lean toward: non-cognitivism
  • Other (17.3%)
Cognitivism: Moral statements have truth conditions.
Non-cognitivism: Moral statements have no truth conditions.


Moral motivation: internalism or externalism?
  • Accept: internalism (34.9%)
  • Lean toward: internalism
  • Accept: externalism (29.8%)
  • Lean toward: externalism
  • Other (35.3%)
Internalism: A necessary connection exists between sincere moral judgment and either justifying reasons or motives.
Externalism: Any connection that exists between moral judgment and motivation is purely contingent.


Newcomb's problem: two boxes or one box?
  • Accept: two boxes (31.4%)
  • Lean toward: two boxes
  • Accept: one box (21.3%)
  • Lean toward: one box
  • Other (47.4%)
Omega appears before you with two boxes and says you may take Box A or take both Box A and Box B. Omega has almost certain predictive power and does not lie. Omega has predicted which you will choose; if Omega predicts you will take just Box A, then Box A will contain $1,000,000. Box B always contains $1,000. How many boxes do you take?


Normative ethics: consequentialism, deontology or virtue ethics?
  • Accept: consequentialism (23.6%)
  • Lean toward: consequentialism
  • Accept: deontology (25.9%)
  • Lean toward: deontology
  • Accept: virtue ethics (18.2%)
  • Lean toward: virtue ethics
  • Other (32.3%)
Consequentialism: The morality of actions depends only on their consequences.
Deontology: There are moral principles that forbid certain actions and encourage other actions purely based on the nature of the action itself, not on its consequences.
Virtue ethics: Ethical theory should not be in the business of evaluating actions, but in the business of evaluating character traits.


Perceptual experience: disjunctivism, qualia theory, representationalism, or sense-datum theory?
  • Accept: disjunctivism (11.0%)
  • Lean toward: disjunctivism
  • Accept: qualia theory (12.2%)
  • Lean toward: qualia theory
  • Accept: representationalism (31.5%)
  • Lean toward: representationalism
  • Accept: sense-datum theory (3.1%)
  • Lean toward: sense-datum theory
  • Other (42.2%)
Disjunctivism: In normal cases, when a person is perceiving something, the object of their perception is a mind-independent object.
Representationalism: Perceptual experience is representational.
Sense-datum theory: The objects of our perception are not mind-independent entities, they are mind-dependent objects called sense-data.
Qualia theory: The phenomenal character of our perceptual experience is non-representational.


Personal identity: biological view, psychological view, or further-fact view?
  • Accept: biological view (16.9%)
  • Lean toward: biological view
  • Accept: psychological view (33.6%)
  • Lean toward: psychological view
  • Accept: further-fact view (12.2%)
  • Lean toward: further-fact view
  • Other (37.3%)
Physical view: The maintenance of personal identity requires bodily continuity.
Psychological view: The maintenance of personal identity requires continuity of psychological states.


Politics: communitarianism, libertarianism, or egalitarianism?
  • Accept: communitarianism (14.3%)
  • Lean toward: communitarianism
  • Accept: libertarianism (9.9%)
  • Lean toward: libertarianism
  • Accept: egalitarianism (34.8%)
  • Lean toward: egalitarianism
  • Other (41.0%)

Proper names: Fregean or Millian?
  • Accept: Fregean (28.7%)
  • Lean toward: Fregean
  • Accept: Millian (34.5%)
  • Lean toward: Millian
  • Other (36.8%)
Fregean: The meaning of a proper name is a way of conceiving of its bearer.
Millian: The meaning of a proper name is its bearer.


Science: scientific anti-realism or scientific realism?
  • Accept: scientific anti-realism (11.6%)
  • Lean toward: scientific anti-realism
  • Accept: scientific realism (75.1%)
  • Lean toward: scientific realism
  • Other (13.3%)
Scientific anti-realism: There are no strong reasons to believe in their theoretical claims about unobservable entities (though epistemic justification of predictions exist).
Scientific realism: There are strong reasons to believe in the theoretical claims about unobservable entities made by our best scientific theories.


Teletransporter (new matter): survival or death?
  • Accept: survival (36.2%)
  • Lean toward: survival
  • Accept: death (31.1%)
  • Lean toward: death
  • Other (32.7%)
You are placed in a machine that will instantaneously disintegrate your body, in the process recording its exact atomic configuration. This information is then beamed to another machine far away, and in that machine new matter is used to construct a body with the same configuration as yours. Would you consider yourself to have survived the process, and teleported from one machine to the other ("survival")? Or do you think you have died, and the duplicate in the far away machine is a different person ("death")?


Time: B-theory or A-theory?
  • Accept: B-theory (26.3%)
  • Lean toward: B-theory
  • Accept: A-theory (15.5%)
  • Lean toward: A-theory
  • Other (58.2%)
B-theory: Specifying the temporal ordering of all events in space-time exhausts all the objective temporal facts about those events.
A-theory: Specifying the temporal ordering of all events in space-time does not exhaust all the objective temporal facts about them.


Trolley problem (five straight ahead, one on side track, turn requires switching): switch or do't switch?
  • Accept: switch (68.2%)
  • Lean toward: switch
  • Accept: don't switch (7.6%)
  • Lean toward: don't switch
  • Other (24.2%)
There is a trolley traveling along a set of tracks. The driver has lost control of the trolley. On the track ahead of the trolley are five people who cannot get off the track in time and will all die if the trolley gets to them. You are standing next to a lever that can switch the track the trolley will take, preventing the deaths of the five people. On the other track is a single person who also cannot get away in time and so will die if you switch the track. Do you refrain from switching the track or do you switch the track?


Truth: correspondence, deflationary, or epistemic?
  • Accept: correspondence (50.8%)
  • Lean toward: correspondence
  • Accept: deflationary (24.8%)
  • Lean toward: deflationary
  • Accept: epistemic (6.9%)
  • Lean toward: epistemic
  • Other (17.5%)
Correspondence: A proposition is true if and only if it bears some sort of congruence relation to a state of affairs that obtains.
Deflationary: Ascribing truth to a proposition amounts to no more than asserting the proposition.
Epistemic: To say that a proposition is true is just to say that it meets a high standard of epistemic warrant, and that we are thereby justified in asserting it.


Zombies: inconceivable, conceivable but not metaphysically possible, or metaphysically possible?
  • Accept: inconceivable (16.0%)
  • Lean toward: inconceivable
  • Accept: conceivable but not metaphysically possible (35.6%)
  • Lean toward: conceivable but not metaphysically possible
  • Accept: metaphysically possible (23.3%)
  • Lean toward: metaphysically possible
  • Other (25.1%)
A zombie is physically identical to a human being but does not possess phenomenal experience. There is nothing it is like to be a zombie.

Inconceivable: We cannot fully conceive of a zombie.
Conceivable but not metaphysically possible: One can arrive at a coherent conception of zombies, but objects that match this conception cannot possibly exist, not even in worlds with different laws of nature than ours.
Metaphysically possible: The existence of zombies is possible.

08 November, 2012

Test Results

When I was young, I was a fan of The Spark, an online community that revolved around taking tests and quizzes about one's personality. It was silly, but I was serious enough about it to actually stay on the site for years, even after they switched over to OkCupid, which is primarily a dating and friendship finding community site.

While most of those tests are now the kind of thing that I don't take seriously at all, there are quite a few that nonetheless have some minor level of legitimacy to them. As I was taking the 2012 LessWrong Census/Survey, quite a few of these test results were requested, and so I ended up retaking several of the more scientific ones. It seemed wasteful to only allow that information to be used for CFAR, so I thought it might be appropriate to pull together these results here in a blog post. Consolidating this data is probably not worth reading for most of my blog subscribers (feel free to close this page now, all of you), but if you're the Eric of the future who is wanting to compare results from these tests taken years later, this is as good a place as any for me to compile the data.

So, without further ado, I present the results of several personality (and other) tests taken this year.

Big Five (OCEAN)


The Big Five test scores on openness, conscientiousness, extraversion, agreeableness, neuroticism. (Hence why it is sometimes referred to as the OCEAN test.) These personality traits are often used by psychologists as a model of human personality. I took the test at outofservice.com/bigfive. My scores are available there, and reproduced below.

  • Openness: 96%
  • Conscientiousness: 96%
  • Extraversion: 4%
  • Agreeableness: 87%
  • Neuroticism: 1%


Political Compass


Political stances differ widely between most people, not just in terms of economic Left and Right, but also in terms of social libertarian/authoritarian values. The test at politicalcompass.org does an exemplary job of tracking one's political views on a two-dimensional grid. My results are available there, as well as below.

  • Economic: -10.00
  • Social: -8.62


Intelligence Quotient


First of all, IQ is not really a useful measure. A simple search through the skeptical literature on how IQ tests are used in our society will easily show this. However, it does have the minor legitimate use of determining one thing in particular: the aptitude of the person taking the test in how well they perform on IQ tests. That sounds silly, but hey: at least it's true. The IQ test I took is available at iqtest.dk, and is wholly pattern oriented, with all cultural questions removed. I scored 122, which is about twenty points less than the score I received in independent testing during my childhood. I'm not sure if this rather dramatic drop says something about the earlier test, this test, or specifically about me.

Myers-Briggs Type Indicator


Jungian typological theories are underneath the MBTI questionnaire, and break down the personality in terms of sensation, intuition, feeling, and thinking. The validity of this test is about on par with IQ; it is currently used, but the evidence for it being useful is lackluster in comparison to how often the test is given. Nevertheless, mainstream opinion seems to be neutral, as opposed to for or against, so it is included here as well. I took the test at Humanmetrics Jung typology test, and received an INTJ classification.
  • Strong preference of Introversion over Extraversion (78%)
  • Strong preference of Intuition over Sensing (100%)
  • Moderate preference of Thinking over Feeling (25%)
  • Moderate preference of Judging over Perceiving (44%)


Hare Psychopathy Checklist (PCL-R)


While all of the above tests were taken in early November of 2012, the results of the PCL-R I record here come from a self-test administered in May of 2012. The PCL-R is a checklist for sociopathic tendencies, and has both adherents and critics in the field, making it unclear as to how seriously one should take the results. The vast majority of people score a 3 or less on the test; sociopaths generally score 25+. I scored 8. Among all friends that I've talked into taking the test, I am by far the highest. (The highest any of my friends has so far scored is 3.) I'm not sure what this says about any sociopathic tendencies I may or may not have, though I should take pains to assure readers that most people consider me to be a very moral person in general.

Final Notes


If for some reason someone is still reading who isn't me in the future, then you might possibly be interested in knowing where you can find more data from tests I've taken or questions I've answered. I will direct such people to my OkCupid profile, which has well over a thousand questions published that I've answered publicly. While OKC is branded as a dating site, the sheer amount of public data there on questions ranging from personality to morality, everyday outlook to political persuasion, and even metaphysical philosophy to aesthetic tastes can be useful for any number of non-relationship purposes. Also related is my Combosaurus account, which has several additional data points. Combosaurus is currently in alpha, so may not be visible to most people yet. They're run by the same engineers behind The Spark and OkCupid.

Also of interest may be my responses to the PhilPapers Survey of philosophers, which lists just about every philosophical position I have on mainstream philosophical questions.

04 November, 2012

Review: The Rapture of the Nerds

The Rapture of the Nerds The Rapture of the Nerds by Cory Doctorow
My rating: 3 of 5 stars

Post-singularity scifi is always weird, but Doctorow & Stross do an excellent job of describing the weirdness rationally in a way that feels more scifi than fantasy. It's definitely a fun read, though I doubt I'd ever choose to pick up the book a second time.

While the largest defect of the novel was (for me at least) an inability to really empathize with the main character, the most visible defect was certainly the sheer number of obscure references packed into the book. Those not moderately versed in physics, philosophy, computer science, political philosophy, science fiction culture, and (of course) the singularity, will undoubtedly miss out on several references the authors make within. Whether it's Nightcrawler or daleks, Nikolai Fyodorovich Fyodorov or Ayn Rand, this novel never stops calling back to outside ideas that most people will not be fully up to speed on, even as the plot relentlessly moves forward.

The profundity of obscurity in most of these references can only be intended as a way of letting the authors reward those readers who catch each reference again and again in an ever-increasing paroxysm of positive reinforcement that makes the reading of this book more akin to playing a video game than visually scanning a physical text. While I can't fault Doctorow & Stross for achieving what they've set out to do here, I can object on the ground that I'm not particularly into this kind of reference-intensive writing. I don't even like it particularly when James Joyce does it in Ulysses, so I hope it's understandable why I dislike how it is done here.

As such, I have decided upon giving this book a mediocre score. Not because it is mediocre per se, but because the area in which it excels is one that I'm just not all that impressed by. I can recommend this book only to those people that are into Joyce-style reference gang-bangs of pop culture mixed with science and philosophy alongside really, really weird post-singularity scifi. If you're into that stuff, read this. If not, stay away. And if, like me, you are slightly interested but not particularly amused by the FLCL-style hijinks, then it might be worth a read, even though it'll never be on your favorites list.

View all my reviews

03 November, 2012

Review: Stories of Your Life and Others

Stories of Your Life and Others Stories of Your Life and Others by Ted Chiang
My rating: 5 of 5 stars

An absolutely wonderful collection of science fiction stories that cut across the genre, from soft to hard scifi, and even venturing into that rarest of subgenres: hard fantasy. These stories made me laugh, cry, and even shudder in ways that most books can't. I'm quite impressed with the highly rational way Chiang writes, and it's doubly impressive when you consider just how much emotional force he imbues in every passage.

If I have any complaint, it is that these are short stories that end all too quickly. Maybe I'm spoiled by the endless series other authors put out, but it really tugs at me when I reach the end of one of Chiang's stories and realize that there's nothing else to read.

I highly recommend this short story collection to anyone and everyone reading this review.

View all my reviews

25 October, 2012

My Favorite Television Shows

As I did earlier in my blog entry on my favorite podcasts, I present here a list of all tv shows that I watch on a regular basis. Some of these I strongly recommend everyone watch; others I am less certain of making a serious recommendation, even though I honestly watch every episode that comes out.

Note that every show on this page is one I watch every time a new episode comes out, so all are shows I obviously consider good. But some are nonetheless better than others. Shows that I strongly recommend are in bold.

How to Use This List


Each show title is linked to its page on ShowRSS for ease of subscribing (except where torrent rss feeds are unavailable or where shows have ended). I highly recommend using ShowRSS; their service automates downloading of new episode torrents (from EZTV) of your favorite shows. Note that setup will require software to take the rss feed from ShowRSS and plug it into your BitTorrent client. (I use Catch and µtorrent respectively. Catch is Mac only; PC users can use Miro instead, though I can't personally vouch for how well it works.)

Where the show is no longer getting new episodes, I've instead linked to a magnet torrent TPB page for the complete series instead. (Be aware that for long series, this will be a BIG download. Use manual searches if you need smaller download chunks.) In the rare case where new episodes are still being made but ShowRSS does not have a feed (this happens when EZTV does not release a torrent rss), I will link to the most relevant page I'm aware of that can direct you to new episodes.

Remember that subscribing to a ShowRSS feed will not get you old episodes. You still need to manually download past episodes to catch up first. If you have any problems, remember that you can always do a manual search on The Pirate Bay.

(Please note that most anime are better subbed than dubbed. Seriously. Some of the anime I recommend below have really bad vocal English tracks. Exceptions are explicit.)

News Programs


  • The Daily Show: Humorous dissection of current news stories.
  • The Colbert Report: Humorous parody of conservative news shows' takes on current stories.
  • Democracy Now!: Straight news. Link is to podcast itunes feed.
  • Frontline: This is perhaps the best in-depth news reporting available today. They consistently put out great investigative news stories. Link is to a podcast feed.

Situational Comedy


  • Arrested Development: The best comedic television show ever made. Seriously.
  • The Office: The pinnacle of uncomfortable situational comedy.
  • Community: Extreme hijinks humor.
  • The Big Bang Theory: A mix of really bad comedy with very good comedy. This feels a bit like SNL in that there are really good parts and really, really bad parts even though BBT is scripted and has no "live" excuse.
  • 30 Rock: Strong meta-situational comedy. Watch more than a couple of episodes before giving up on this; it takes a while for viewers to realize just how good some of this writing is.
  • South Park: Low-brow comedy wedded to high-brow social commentary.
  • Robot Chicken: Pop culture nostalgia comedy.
  • Daria: Animated comedy on high school related issues.
  • Cheers: Classic sitcom that's surprisingly good. Link is to several torrents by season.
  • Archer: Fast-paced line-by-line comedy.

Science Fiction


  • Firefly: Western sci-fi awesomeness.
  • Cowboy Bebop: More western sci-fi awesomeness. Link is to dual audio. Excellent English voice actors.
  • Babylon 5: Well-rounded sci-fi epic. Has a bit of each genre and is clearly a part of '90s culture, but has themes which overcome these initial hurdles.
  • Battlestar Galactica: The dramatic remake of BSG is what most current scifi shows consider as the standard dark scifi series. (Compare to ST:TNG, the "standard" light scifi series.) Spinoff Caprica will be of interest to fans.
  • Stargate Universe: While I enjoyed the previous Stargate series more than the average guy, SGU is a clear standout in the Stargate universe (pun intended). This is worth watching even if you're unfamiliar with Stargate canon in general.
  • Star Trek: Every series (tos, tng, ds9, voy, ent) is well worth watching. Quality of individual episodes does vary, but the cultural value of seeing the best of them is worthwhile.
  • Farscape: Fair warning: this takes a long time to get into. A full appreciation requires an attention to detail that most shows do not demand of viewers.
  • Stargate: Note that Stargate Universe is a bold recommendation above. Other entrants in this series (SG1, SGA) are worth watching, but not at the level of SGU.
  • Doctor Who: Classic sci-fi. Not the best on a show-by-show basis, but worth watching for the long-term lore and cultural appeal. If you're new to the series, start with the ninth doctor (the 2005 series 1) and only watch the older episodes if you become obsessed (as many do). Spinoff Torchwood is terrible, but still of interest to fans.
  • Ghost in the Shell: Philosophically dense sci-fi anime. Link is to dual audio. Excellent English voice actors.

Fantasy


  • My Little Pony: Friendship is Magic: Yes, I'm serious. MLP reeks of cuteness and every episode warms my heart. No other show can cheer me up as fast as this. Link is to an r/mylittlepony post that is kept well-updated.
  • The Vision of Escaflowne: Perhaps the best anime series of all time. Worth watching even if you've never had any interest in anime before. Link is to dual audio.
  • Neon Genesis Evangelion: An anime classic. Philosophical, topical, yet clearly aimed at a young audience. Worth watching just for the cultural value of being familiar with it alone. Link is to dual audio.
  • FLCL: An extreme example of parody taken seriously. On one view, this is a commentary on the state of anime post-evangelion; but at a deeper level, this parodies the art of parody itself by turning what would be a mockery into an actual good story on its own merits. I had to watch this short series multiple times before I fully appreciated most of the concepts it had to offer. Link is to dual audio.
  • Kino's Journey: Philosophically dense anime. Link is to dual audio.
  • Read or Die: No other show uses quite this many literary references. While this could be a bad thing, it seems to work well in this anime. Link is to dual audio.
  • Game of Thrones: While I strongly recommend reading the books first, you should definitely not forget to watch HBO's brilliant portrayal of the story once you're ahead in the novels.

Drama


  • Breaking Bad: The drama of turning to crime under adversity.
  • Sherlock: The best Sherlock Holmes adaptation ever made.
  • The Walking Dead: The best zombie tv series lacks in several respects, but hey: it's the best zombie series that exists.
  • West Wing: Hands down some of the best dialogue I've ever seen in a tv series.

Non-Fiction Non-News Programs


  • Closer To Truth: Discussion on philosophical topics with roundtable discussion by experts that strongly disagree.
  • Bullshit!: Penn & Teller do a fairly good job of bringing skepticism to the masses in this show, though their libertarian bias does tend to show in some episodes.
  • MythBusters: While I have philosophical problems with the lack of rigor used in this show, I nevertheless enjoy how they bring skeptical ideas to the masses.
  • NOVA scienceNOW: Neil deGrasse Tyson does a superb job of making scientific topics accessible to a general audience. Link is to a podcast feed.

Other Categories of Programs


I'd hate to end this list without at least mentioning other categories of media, like Dr. Horrible's Sing-Along Blog, or the various podcasts I adore listening to. I also plan to write a post on my favorite movies of all time, though it has yet to published.

I should also mention that there are a few shows that I enjoy that are not listed here, whether it is because it's been so long since they ended that I've forgotten they exist or because they only just started and I'm undecided on if I really like them or not (like Elementary). As time passes, I'll try to go back and edit this post to add shows I neglected on my first draft.

Review: Disgrace

Disgrace Disgrace by J.M. Coetzee
My rating: 1 of 5 stars

I wanted to like this book. It was recommended to me by a friend who is using it as one of the books she's writing her apartheid literature thesis on. Unfortunately, I just couldn't get into it.

The main character is wholly unlikeable in my eyes. I can see that the author wanted us to sympathize at least a little with him, but every successive chapter involved him doing or saying something which made me think even less of him. Even in the later chapters, where it looks as though the author is trying to portray him as growing and becoming more morally aware, the result is just that I come to fully appreciate just how backwards his thoughts truly are, if this is what counts as moral progress for him.

Of course, the fact that I dislike a character does not mean I dislike a book; there are several books that I enjoy where every character is disliked in some fashion. But, unfortunately, my inability to sympathize with the main character defeats the purpose of this novel. I'll explain, but be aware spoilers are ahead.

Lurie, the main character of the novel, goes through a journey in this book. He starts out thinking there is nothing wrong with trying to seduce a student at the college where he works. But before you can even express disgust at how nonchalantly he treats the issue, he opts to not just seduce, but actively rape the girl. In the scene where he rapes her, his inner monologue justifies it as not being rape at all. I realize that the author is not condoning rape of this kind -- in fact, the author is trying to get people to see that rape like this is wrong later on in the book. But I can't go on this journey of moral discovery because I agree already that it is wrong, without even seeing the parallels later on that show why it is wrong.

Yet this is not what makes me dislike Lurie the most. Instead, it is his idiotic view of the world. He is atheist, yet he believes in souls and continually talks about them as though they are what is truly important. His dismissal of animals is particularly cruel, which he justifies as acceptable due to them not having souls. Even later, when he starts to feel some measure of caring for animals, he STILL considers them soulless, and cannot intellectually accept his feelings of empathy. He even expresses disdain at the thought of owing moral duties to a friend of his daughter that he only just met.

All of the above is enough for me to just not get into the novel. But it gets worse. Since Lurie is a professor that's into poetry, he throws around poetry references and distinctions between declinations of words in different languages that just go completely over my head. I can't follow at all two of the chapters in the book (what they mean or are meant to portray is completely beyond my understanding) and several of his thoughts throughout the book that refer to how English words are insufficient due to baggage are ones I actively disagree with. The baggage he thinks is there is only present because he insists on infusing every word with baggage; yet if he would only take the speaker's intent into consideration rather than the specific words they use, he wouldn't have a problem. In one scene, a person speaks who has very little understanding of English, and Lurie can't get past the words the speaker happens to choose. Why can he not realize that the baggage of the words comes from Lurie's head, and not the speaker! The speaker can't possibly know all these poetic references, and is obviously meaning something quite direct that does not rely upon the connotations that Lurie insists are there.

But perhaps the most irritating to my eye were the characters that showed some level of compassion. Lucy starts out sounding great, but turns out to be an idiot. Bev seems approachable, but then it turns out she is more into new age crap than true deep thought. I was continually disappointed by all characters, but perhaps this was Cotzee's intention. Nevertheless, even if it was done on purpose, this lack of sympathy that continued throughout the entire novel really made it where I just couldn't relate. These people are just too different.

However, the book has won several awards and is apparently well liked by many critics who know much more about this kind of literature than I do. Perhaps my problem with the book is that I just didn't follow the real narrative, which I assume was lying just beneath the surface, unseen by my ignorant eyes.


View all my reviews

23 October, 2012

My Favorite Podcasts

I subscribe to a lot of podcasts. I use podcasts to keep up with the news, learn more about the world, and expand my mind generally. As such, I've sampled and stopped listening to more podcasts than most people have even heard of. According to some of my friends, this makes me a fairly good judge of which podcasts are worth investing a bit of time in. Thus, I decided to start maintaining this list of my favorite podcasts.

Strong recommendations are in bold, and should be seriously considered. Non-bold recommendations are good enough to cause me to download and listen to every episode they release, but maybe do not quite stand out enough for me to give a full recommendation. All podcasts recommended on this page are rated five stars by me on itunes; the distinction between bold and non-bold recommendations is slight at best.

Note that I am a man of very specific tastes. I adore philosophy and I have a strong tendency toward rationalism, skepticism, and mathematical rigor. This certainly affects what I consider to be a worthwhile podcast to subscribe to. YMMV.

The Best Philosophy Podcasts


The field of philosophy is blessed to have so many exceedingly good podcasts available to choose from. Some are short bite-sized chunks while others go moderately in-depth on philosophical topics. For serious users, there are even a few excellent full course podcasts available on iTunes University; listening to such a series takes many, many hours, but it can be well worth the time investment if you're fully interested in the topic.

Short-form philosophy podcasts:
  • Philosophy Bites (itunes, blog): 15-20 minute weekly interviews of philosophers on philosophical topics by David Edmonds and Nigel Warburton.
  • The 10-Minute Puzzle (itunes, site): 10 minute sporadic introductory discussions on philosophical puzzles by Federico Luzzi and Aidan McGlynn.
  • Ethics Bites (itunes, site): 15-20 minute sporadic interviews of philosophers on ethical dilemmas by David Edmonds and Nigel Warburton.
  • Morality in the Real World (itunes, site): 20 minute sporadic episodes on desirism by Alonzo Fyfe and Luke Muehlhauser. Shows the thinking process of specifically explicating a theory over time, making changes along the way. (Note that desirism is not a theory I subscribe to.)
  • The Big Ideas (itunes): 10 minute sporadic mini-introductions on the main ideas in philosophy.
Medium-form philosophy podcasts:
  • The History of Philosophy Without Any Gaps (itunes, blog): 20-30 minute weekly discussions on the history of philosophy by Peter Adamson.
  • Elucidations (itunessite): 25-45 minute weekly interviews of philosophers on philosophical topics by Matt Teichman and Mark Hopwood.
  • The Moral Maze (itunes, site): 45 minute weekly heated debates on practical moral issues by non-philosophers.
  • The Philosopher's Zone (itunes, site): 25 minute weekly discussions on philosophical topics by the late Alan Saunders. (A replacement host has not yet been chosen; episodes resume in 2013.)
  • The Public Philosopher (itunes, site): 45 minute sporadic talks by Michael Sandel. Includes a lot of audience participation.
  • Minerva (itunessite): 30 minute monthly episodes on major philosophical topics.
Long-form philosophy podcasts:
  • The Partially Examined Life (itunes, blog/forum): 2 hour weekly discussions on philosophical readings aimed at a moderately informed audience. Their forum includes reading groups where listeners can discuss topics more in-depth, which is perhaps the most awesome thing ever.
  • Why? Philosophical Discussions About Everyday Life (itunessite): 1 hour bi-weekly interviews on philosophical topics with Jack Russell Weinstein. The host is very good at asking great questions of guests that cut to the heart of philosophical positions.
  • Philosophy Talk (site/forum): 1 hour weekly discussion on philosophical topics with a call-in audience. Their podcast feed goes through iAmplify, which is terribly confusing and irritating, but each week's episodes are free to download if you can figure it out. Be aware that past episodes are not freely available, making this show impossible to use with philosophy discussion groups.
  • New Books in Philosophy (itunes): 1 hour biweekly interviews with authors about their newly published books on philosophy. These are easily the most dense of all podcasts listed here, as they go fairly in-depth on specific topics — but every episode is accessible to a moderately well-informed philosophical audience. Unfortunately, the audio quality is not ideal.
  • Philosophy Now (itunessite): 1 hour sporadic interviews on philosophical topics.
  • Such That Cast (itunessite): 1 hour monthly interviews with philosophers. Does not focus on specific philosophical problems, but just consists of a freeform conversation between the interviewer and interviewee. This sounds terrible, but is actually really good.

The Best News Podcasts


I don't always agree with the viewpoints expressed on the following programs, but I listen to all of them regularly. I feel it's important to expose oneself to alternate viewpoints on a regular basis as a method of keeping one's political bias in check.

Straight news:
  • Democracy Now! (itunes video or audio, site/blog): 1 hour daily news program that gives proper air time to voices on the far left. Amy Goodman often raises issues most news sources do not.
  • NPR News Summary (itunes): 5 minute daily morning news summary. This is easily the best source of headlines each day.
  • NPR Story of the Day (itunes): 3-10 minute daily stories on various topics. The best story of the day is usually interesting, though you never know what it will be about in advance.
  • C-SPAN Podcast of the Week (itunes): 1 hour broadcast of the best event that week on C-SPAN. Topics vary widely but are always worth the download.
  • C-SPAN Newsmakers (itunes): 30 minute interviews with people currently in mainstream political news stories.
  • Frontline (itunes): This is perhaps the best in-depth news reporting available today. They consistently put out great investigative news stories.
(I should also mention The Daily Show and The Colbert Report here, although neither is available as a podcast. Links are to rss EZTV feeds. See my follow-up post on my favorite television shows for more information.)

Financial news:
  • Planet Money (itunes, blog): 15-30 minute biweekly financial stories. Episodes can be funny, insightful, alarming, or all of the above. Worth a listen even if you don't like financial news in general.
  • Marketplace (itunes, blog): 30 minutes daily financial news. Fairly in-depth information for those interested in financial topics. Not worth a listen if you aren't into financial news.
  • Marketplace Morning Report (itunes): 7 minute daily morning financial news summary.
  • Motley Fool Money (itunes): 45 minutes weekly discussion of stocks.
Sunday Morning Talk Shows:
  • This Week (itunes): 45 minutes weekly political discussion with George Stephanopoulos. They're consistently late on putting these out, but the content is worth it.
  • Fox News Sunday (itunes): 45 minutes weekly political discussion with Chris Wallace. Despite Fox's deserved reputation for lying, Wallace does an almost respectable job of asking tough questions to those on the right.
  • Meet the Press (itunes): 45 minutes weekly political discussion with David Gregory. They're consistently late on publishing each episode, and past episodes are not available for download.
  • State of the Union (itunes): 45 minutes weekly political discussion with Candy Crowley.
Note that I do not approve of the Face the Nation podcast and cannot recommend that anyone subscribe to it. Each episode is one hour long, with a full third of it being nothing but commercials. Of the 40 minutes of content, some 5-10 minutes is wasted on sports commentary rather than political discussion. Listening to this show might be worthwhile if you watch it live on tv, but in podcast form, it is completely unbearable.

The Best Science Podcasts


I adore science. If you do, too, then you'll enjoy these excellent podcasts.
  • Freakonomics (itunes): 30-45 minute weekly episodes on unusual economic topics. Some 5-minute weekly mini-segments are also in this feed.
  • Radiolab (itunes): 1 hour weekly episodes on science and culture.
  • Science Friday Video (itunes): 5 minute weekly videos on a science topic. While I don't make time to listen to the hour long radio show regularly, their five minute videos are well worth watching.
  • Nova scienceNOW (itunes): 5 minute sporadic videos on a science topic.
  • StarTalk (itunes): 1 hour sporadic episodes on comedic takes of science topics with Neil DeGrasse Tyson. Uses a lot of comedy.
  • Social Science Bites (itunes): 15-20 minute weekly interviews of social scientists on topics by David Edmonds and Nigel Warburton.
  • 60 Second Earth (itunes): 1 minute weekly mini-episodes on earth science topics by Scientific American.
  • Minute Physics (itunes): 1-5 minute weekly mini-episodes on physics topics.
  • Brain Science Podcast (itunes): 1 hour monthly interviews on recent discoveries in neuroscience and how they relate to our philosophy of mind. These can get pretty technical at times.

The Best Skepticism Podcasts


The skeptic community has a lot of podcasts out there, but unfortunately the quality is a bit lacking in many of them.
  • You Are Not So Smart (itunes): 1 hour monthly interviews on rationality. This is one of the best skeptic podcasts currently being made. Far too many skeptic podcasts are aimed at dealing with absolutely ridiculous claims like bigfoot, ghosts, or homeopathy; but the YANSS podcast deals with dubious claims that even established skeptics may still fall for.
  • Consequence (itunes): 30-45 minutes biweekly interviews with people harmed by pseudoscientific claims. These are first-hand accounts of the harm caused by belief in false things.
  • For Good Reason (itunes): 45 minutes sporadic interviews on skeptical issues.
  • Skeptic's Guide to the Universe (itunes): 1 hour weekly episodes on skeptical issues.
  • Reasonable Doubt (itunes): 1.5 hour bi-weekly episodes on roundtable discussion of atheism and skepticism.
  • Rationally Speaking (itunes): 1 hour bi-weekly episodes on rationality.
  • Reality Check (itunes): 1 hour weekly roundtable discussion on skeptical issues.
  • Point of Inquiry (itunes): 45 minute weekly interviews with scientists on skeptical issues.
  • The Randi Show (itunes): 5-10 short conversations with James Randi.
  • Conversations from the Pale Blue Dot (itunes): 1 hour sporadic interviews with Christians and atheists on the divide between the two.
In any list of the "best" skeptic podcasts, there must be at least some mention of Skeptoid and Skepticality, due to their wide popularity among skeptics. Neither has made my list.

Skeptoid focuses on stories about false claims. It feels like a podcast that tells ghost stories and little more. Meanwhile, Skepticality has some great segments at the beginning of each episode, but the main part of the podcast is just terrible. I really dislike the main host. His voice is not appropriate for radio, and his interview style is more hurtful than helpful in learning about guests' positions. Not as important (but notable enough to mention) is the very, very, very bad theme song. Seriously, Skepticality has perhaps the worst theme song of any popular podcast I've ever heard.

The Best History Podcasts


I wasn't very interested in history as a child; I was more of a science and math person. That's why these podcasts are so very exciting to me — my prior lack of knowledge in the field means I always learn something new in every episode. Your experience might be different if you're already well versed in these topics.
  • The History of Philosophy Without Any Gaps (itunesblog): 20-30 minute weekly discussions on the history of philosophy by Peter Adamson. Perhaps it's unfair that I've listed this podcast twice in two different categories, but it's just that good.
  • In Our Time (itunessite): 20-30 minute weekly episodes on the history of ideas by Melvyn Bragg.
  • The History of Rome (itunes): 30 minute episodes on the complete story of the Roman empire from beginning to end. This podcast series is complete, with no newly published episodes.
  • The History of Byzantium (itunes): 30 minute weekly podcasts on the history of the Byzantine empire. This series starts where the History of Rome podcasts ends; I strongly recommend listening to the History of Rome series first.
  • A Brief History of Mathematics (itunes): 15 minute short introductions on the history of mathematics. Series is complete with no new episodes.

Other Podcasts I Enjoy


Not everything I listen to is easily categorized, but I still recommend them just as strongly.
  • This American Life (itunes): 1 hour weekly episodes on various topics. If you only subscribe to one podcast recommended on this page, let it be this one.
  • Harry Potter and the Methods of Rationality (itunes): 25 minute weekly audiobook episodes of Eliezer Yudkowski's fanfiction epic. I know the idea of fanfiction may sound silly at first, but this will blow your mind.
  • The Dice Tower (itunes): Hour long weekly episodes on board game reviews.
  • Ludology (itunes): Hour long weekly episodes on board game design.
  • Smiley and West (itunes): 1 hour weekly episodes on political and other issues with Cornel West and Tavis Smiley. Gives a far left viewpoint.
  • State of the Game (itunes): 2.5-3 hour sporadic episodes on issues in the StarCraft 2 professional gaming community.
  • This Week in Tech (itunes): 1.5-2 hour weekly episodes on technology news with Leo Laporte.
  • Oyez Project Arguments (itunes): 1-4 hour sporadic recordings of Supreme Court oral arguments. Link is to 2012 term; Oyez creates a new podcast feed for every year for some reason.
  • Facing the Singularity (itunes): 5-10 minute episodic lecture on what taking the singularity seriously means. Podcast series is complete with no new episodes.
  • Reith Lectures (itunes): 5 single hour long yearly lectures by significant cultural figures.
  • Flack Check (youtube): 1 minute daily episodes showcasing the lies politicians tell with an element of humor. Link is to youtube because their itunes feed is not out yet.

Final Notes


Obviously, I consume a lot of content. When you add to this list the other media I regularly consume like television shows and movies, it becomes obvious that I spend a LOT of time on consumption in general. While this may make me good as a judge of comparing different media types for others to better know what they should spend their scarce time upon, it does highlight the sheer percentage of time I dedicate to items that most people think is (mostly) a waste of time.

Honestly, I do not mind others making this judgment. It's a judgment I sometimes think I agree with. But, overall, I'm fairly happy with my current level of consumption. While I might change these habits in the future, I would require an equal level of intellectual stimulation on a broad range of topics to really make up for the content I now consume everyday. I might be committed to the cause of optimal philanthropy, but focusing on only one area is just not something that I ever think I could do while maintaining my current levels of happiness. That's why I fully expect to continue to consume such a large amount of content like this on a regular basis.


Edit: Commenters have brought two additional philosophy podcasts to my attention: Public Ethics Radio and The Thirst. I've yet to listen to them, but they appear interesting.