/r/askscience
Why can our brain automatically calculate how fast we need to throw a football to a running receiver, but it takes thinking and time when we do it on paper?
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If you had a million mirrors placed in such a way that each would reflect off the next one, and you stand in front of one and move, would there be any lag between your movement and what appears on the final mirror?
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If you were orbiting a black hole just a few feet outside the event horizon and you stuck your arm past, what would happen when you tried to pull it out?
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