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How accurate is the quantum physics sequence?

Yep, he says so explicitly here: http://physics.stackexchange.com/questions/22578/can-black-holes-be-created-on-a-miniature-scale#comment52219_22601

Um... I am not exactly knighted, so I don't know why you would call me "sir" (except perhaps the jokey Isaac Newton business in my bio--- that's a nod to John Baez "crackpot index", where comparison of yourself to Newton gets you 100 points).

Crash problems for total futarchy

Isn't it already, in some sense? The whole idea of a futarchy is shareholders voting for their self-interest so it also works in the interests of everyone else. This is pretty much what goes on in companies where shareholders get a vote proportional to their shares held.

Humans are utility monsters

I discussed this recently elsewhere: https://utilitarian.quora.com/Utility-monsters-arent-we-all I'm glad I'm not the only one who's thought of this.

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Fake Selfishness

I used to think about self-proclaimed selfishness in this way all the time, but now I think I "get" the doctrine of selfishness. For instance, the answer to the first mischevous question is actually "because I get personal happiness from preaching selfishness, and that vastly overshadows any happiness I could instead get from a single person's altruism". The answer to own life vs. human species is "because a guilt-ridden life wouldn't maximise my personal happiness", and so on.

A Voting Puzzle, Some Political Science, and a Nerd Failure Mode

There's a solution I always thought of since young, that is instead of letting voters vote for a single candidate of their choice, let them assign each candidate a score and the representation will be defined by the total score of a party's candidates.

Perhaps it would be better to let voters rank the candidates instead, and assign each rank a well-defined score, if directly assigning a score is to arbitrary.

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One Life Against the World

Not necessarily. A full argument would consider the opportunities available to a child you raise -- it's perfectly possible for a single first-world child to be a more productive than 180 kids in Africa.

There's also the counter-point (to my previous point) that having children discourages other people from having children, due to the forces of the market (greater demand for stuff available to children => greater costs of stuff available to children). Of course, the effect on demand is spread out to stuff other than just stuff available to children, so overall this does not cause an equal and opposite reaction.

If you successfully teach your child to be utilitarian, effective altruist, etc., though, the utility of both previous points are dwarfed by this (the second point is dwarfed because the average first-world child probably wouldn't pick up utilitarianism, EA). I'm not sure what the probability of a child picking up stuff like that is (and it would make one heck of a difficult experiment), but my guess is that if taught properly it would be likely enough to dwarf the utility of the first two points.