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asourcefamiliarwiththematter | 2 days ago (raw) | root | parent | reply | flag 
 what's special about the up-down direction?

why doesn't a pound of wood get pushed East in water?
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theguy | 2 days ago (raw) | root | parent | reply | flag 
 Good question. Philosophically speaking, for all we know everything might be tied to other directions, but we might automatically perceive that as an up-down one for convenience.