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 Applying Science to Science Fiction      Fun fact about the color blue in animals: blue is not caused by pigments. Most pigments that animals exhibit on their fur etc are caused by the food they eat. Blue however is very rare in nature and more often caused by the structure of molecules and the way they reflect light. The blue morpho butterfly for example is that color because its wing scales are shaped in ridges that causes sunlight to bend in such a way that blue light, at just the right wavelength, is reflected. Blue jays' feathers are made up of light-scattering, microscopic beads spaced in a way that everything except blue light is cancelled out.The only natural blue pigments belong to obrina olivewing butterflies.     So how do we apply this to science fiction? You've probably seen blue hair in fictional works and anime. It's common yet never explained. We are left to assume the character dyed their hair. But what if it was natural?  ...