And it's a mystery.
We might get around to sending a probe to Uranus (and Neptune) before a century has passed since the Voyager-2 flyby. Or maybe not.
A blog by a "sucker" and a "loser" who served her country in the Navy.
If you're one of the Covidiots who believe that COVID-19 is "just the flu",
that the 2020 election was stolen, or
especially if you supported the 1/6/21 insurrection,
leave now.
Slava Ukraini!
Saturday, November 11, 2023
1 comment:
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Not many human tetra or penta chromats
ReplyDeleteIn tetrachromatic organisms, the sensory color space is four-dimensional, meaning that matching the sensory effect of arbitrarily chosen spectra of light within their visible spectrum requires mixtures of at least four primary colors.
Tetrachromacy is demonstrated among several species of birds,[2] fishes,[3] and reptiles.[3] The common ancestor of all vertebrates was a tetrachromat, but mammals evolved dichromacy, due to the nocturnal bottleneck, losing two of their four cones. Some primates then later evolved a third cone.[4]....
The dimensionality of color vision has no upper bound, but vertebrates with color vision greater than tetrachromacy are rare. The next level is pentachromacy, which is five-dimensional color vision requiring at least 5 different classes of photoreceptor as well as 5 independent channels of color information through the primary visual system.
https://en.wikipedia.org/wiki/Tetrachromacy