Mantis Shrimp Have 12 to 16 Types of Color Receptors
Humans have only three, though the mantis shrimp's vision may not be better at telling colors apart.
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Pink Is Not a Color of the Spectrum
No single wavelength of light is pink, so the brain constructs it by mixing red and violet.
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Purple Dye Was Once Worth More Than Gold
Tyrian purple was made from sea snails and reserved for royalty.
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Isaac Newton Split White Light With a Prism in 1666
He identified seven colors in the spectrum.
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Humans Can Distinguish About a Million Colors
Most people have three types of cone cells in their eyes.