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To test a perfect theory with imperfect instruments did not impress the Greek philosophers as a valid way to gain knowledge.
— Isaac Asimov
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The pre-Socratic Greek philosopher Parmenides taught that the only things that are real are things which never change... and the pre-Socratic Greek philosopher Heraclitus taught that everything changes. If you superimpose their two views, you get this result: Nothing is real.
— Philip K. Dick
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