🔬 Science 19h ago · Ethan Siegel

Why mirrors flip left-to-right but not up-and-down

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Why mirrors flip left-to-right but not up-and-down
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If you’ve ever looked in a mirror, you’ve likely noticed that everything you see is flipped. When you raise your left hand, your reflection raises their right hand. When you wink with your right eye, your reflection’s left eye winks back. And if you write a message and hold it up, you’ll see your reflection hold up the identical sign, but everything appears backward, even the individual letters themselves. It appears that everything you see reflected in the mirror has their left-and-right revers

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