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Metus comments on Open thread, Dec. 8 - Dec. 15, 2014 - Less Wrong
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I am a graduate student of physics and I am inclined to say that I now know even less about what energy is.
Oh, that's easy. It's just another word for wakalixes.
(Two irrelevant remarks: 1. Sorry, that webpage is eyeball-bleedingly ugly. 2. I conjecture that the last two words in the excerpt are why HPMOR!Harry chose to give his army a name that enabled him to call himself General Chaos. I suspect, more precisely, that at some point Eliezer read that bit of Surely you're joking... and thought "hmm, General Chaos would be a good name for a supervillain or something".)
Hm. If I had to give an answer, I'd say it's the stuff that's conserved because the laws of physics don't change over time. But that's pretty theoretical - maybe an extensional definition would be better.
Maybe completely blanking on that question is a sign of having studied some physics?
The difference is that the guy who studies physics can explain why the question is difficult.