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How do we know we live in three dimensions? Here's a clue: it's not just that we have to use three coordinates (like x,y,z, or latitude, longitude, altitude) to label every point in...
Imagine the 2d world, where it's impossible to go UP, or DOWN. A 3d world implies that there are infinite planes adjacent to this 2d world. A 3d entity can see across a multitude of 2d planes,...
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Everyone loves the idea of parallel universes - maybe it's the appeal of an ideal world where you have second chances and things turn out differently - an alternate reality where you do get...
