/u/grkirchhoff's posts
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If the distance between 2 points in spacetime is sqrt(x^2+y^2+z^2-ct^2), does that mean that the further away 2 events are in time, the closer they are in spacetime?
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If you mix up the letters in a word (except the first and last) you can still read it easily. Is this true for blind people reading brail?
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After the sun expands to consume the earth, will earth continue to orbit as before, just inside the corona now?
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