Ultraviolet a

I know that, in addition to our eyes, which can process visible light, there are some bird eyes that can process the smaller, ultraviolet waves (because of an extra pigment molecule, I think). In contrast, it seems unlikely that cells, which are small, could ever process radiowaves, which ...

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With less ultraviolet light maybe it could be advantageous to lose pigments in our skin cells. That is something that can be genetically engineered.

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... time in an environment which is slightly different from ours, here and there--perhaps a bit more nitrogen in the atmosphere, perhaps a bit less ultraviolet light to contend with. After that thousand years, they return to Earth looking and functioning with a notable difference in culture and ...

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... than it is now. This layer of ice, possibly hundreds of feet thick, might have protected fragile organic compounds in the water below from ultraviolet light and destruction from cosmic impacts. The cold might have also helped these molecules to survive longer, allowing key reactions to ...

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... their main predators, birds and other insects, can see green. Most insects are sensitive to all colours except red and infrared, and can even see ultraviolet. A number of studies were cited by A. D. Imms FRS in his book 'Insect Natural History', however I haven't personally looked into these. ...

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