http://www.post-gazette.com/pg/06256/721190-114.stm
A tetrachromat is a woman who can see four distinct ranges of color,
instead of the three that most of us live with.
[...]
Based on Dr. Neitz's estimates, there could be 99 million women in the
world with true four-color vision.
But before they pat themselves on the back for their superior evolution,
he said, it's important to note that humans are just getting back to
where birds, amphibians and reptiles have been for eons.
Those creatures have long had four-color vision, but a key difference is
that their fourth type of color detector is in the high-frequency
ultraviolet range, beyond where humans can see.
Share and enjoy,
*** Xanni ***
--
mailto:xanni@xanadu.net Andrew Pam
http://www.xanadu.com.au/ Chief Scientist, Xanadu
http://www.glasswings.com.au/ Partner, Glass Wings
http://www.sericyb.com.au/ Manager, Serious Cybernetics
