/u/Nice_Dude's posts
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How does the hair "know" to stop getting longer on our arms and eyebrows/eyelashes, but just keeps getting longer on top of the head?
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Although nothing can travel faster than the speed of light, if you shined one flashlight directly east and the other directly west, would the light photons traveling east appear to be going faster than the light photons going west, or vice versa?
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