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blog.sciencescore.com
9YZ1G
TIL that blood turns green when 30 feet underwater, because red light cannot reach that far down so the green pigments in our blood are reflected back instead.
WkQDN
TIL that at about thirty feet underwater, blood appears green, due to red light having been filtered out by the water
7lYX
TIL 30 feet underwater there is no red light, so blood appears green