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Blue is one of the three primary colours in the RYB colour model (traditional colour theory), as well as in the RGB (additive) colour model. It lies between violet and cyan on the spectrum of visible light. The eye perceives blue when observing light with a dominant wavelength between approximately 450 and 495 nanometres. Most blues contain a slight mixture of other colours; azure contains some green, while ultramarine contains some violet. The clear daytime sky and the deep sea appear blue because of an optical effect known as Rayleigh scattering. An optical effect called Tyndall effect explains blue eyes. Distant objects appear more blue because of another optical effect called aerial perspective.
This nudibranch (Felimare californiensis) is making a comeback to a location it hasn't been to in years. First discovered off the coast of Southern California in 1902, it was thought to be extinct in the region since 1984 due to pollution. But the nudibranch, with its blue and gold color scheme (matching the University of California), has been spotted off the Southern California coast several times since 2003. Scientists have their fingers crossed that this indicates a larger comeback for the species.
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