Before the invention of mirrors, people lived their entire lives without knowing how they looked like. The closest anyone could come to see themselves was in a pool of water or on a shiny copper or ...
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Why mirrors seem to reverse left and right but not up and down
Why, in a mirror, is the writing on your t-shirt backwards but your head and feet where they belong? The puzzle of why mirrors appear to reverse left and right - but not up and down - has confused ...
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