/u/Dunavks's posts in /r/askscience
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Do all living creatures (that have eyes) perceive shadows? If so, are there any differences between how shadows are perceived?
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Suppose I'm looking through a window of a bus in the night. The interior is lit. The reflection I see on the window, does it form because we can see better in light then dark? Or is it because the window has reflectional properties? Is it a combination of both?
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Is there a reason why we use infrared light for sending data? Could we do it with any other colour wavelength?
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Why do people from Europe have different kinds of eye and hair colour when generally, most other parts of the world have dark hair and dark eyes?
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