/u/PapaChewbacca's posts in /r/askscience
How do mammals and birds that dive past the ocean twilight zone know if they're descending or ascending after a certain point? Isn't everything pitch black down there?
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At what point does a person who is learning a language know when a certain sentence structure sounds wrong or right?
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If block-chain technology is just a big ledger of transactions, why is cryptocurrency like Bitcoin considered to be untraceable?
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If Earth had been absent of any negative externalities in the past and the future, could life in the world have been self-sustainable for an indefinite period of time?
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