Dr Deviant

This is quite a cool question. Parties can’t swing without it, we can’t survive without it, and blue skies would be black and spotty without it: Atmosphere. In short, the blue sky is caused by particle diffraction. The air we breathe is made of molecules of common substances; nitrogen and oxygen being the main constituents.
Sunlight [...]

No. This is a very popular old wives tale. I think it was first mentioned by Aristotle and other ancient sources, and just believed to be true cuz no one could be bothered to go check.
The theory goes that if you are looking at only a tiny spot of bright light, your eyes become more [...]