The Biology of Skin Color: Black and White By Gina Kirchweger
It can be found here
The author discusses why scientists think humans first became hairless (the need to sweat to stay cool in the open savannas), developed dark skin ( to protect vitamin B in the skin from breakdown by UV light, important during pregnancy (tanning beds are harmful during pregnancy)), and then evolved lighter skin in upper latitudes (to absorb more vitamin D, also very important during pregnancy).
This is a good description how the "races" evolved. I personally care little about someones vitamin B & D levels. Our DNA is almost exactly the same, deposition of melanin is not what makes a person who they are. _________ ___
Judging a governor for installing/using a tanning bed? Well she doesn't believe in science anyways, and falls into the category of the ignorant, along with all the racists.
