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... almost any time you see blue in
the animal world (blue eyes, blue jay's feathers, even a baboon's blue
buttocks) it is due to Rayleigh scattering. [Hecht]
At 14:48 8/30/00 -0700, Leigh pointed out:
... Hecht's statement as reported here is excessive.
It is an injustice to call this phenomenon "Rayleigh scattering" since
it was first demonstrated by John Tyndall. Both Tyndall and Rayleigh
initially thought that the phenomenon was due solely to particles
suspended in the air or gas, and Rayleigh only changed his mind after
Tyndall's death. ....
Leigh