/u/best_of_badgers's posts in /r/askscience
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The Americas are populated by the descendants of people who were willing (mostly) to uproot their lives and undertake an arduous sea voyage. Has this ever been shown to affect inherited psychology vs either indigenous Americans or Old World peoples?
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Vacuum decay bubbles are supposed to expand at the speed of light, consuming the universe. But the distant universe is expanding away from us faster than the speed of light and will accelerate. So what happens when the vacuum bubble can't keep up?
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Why do some insects and spiders have such a narrow "waist" joining the thorax and abdomen? What evolutionary benefit might it provide? Seems like it would break very easily...
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