By around 30 million years ago, our ancestors had evolved the ability to see the full-color spectrum of visible light, except for UV.By Carol ClarkMany genetic mutations in visual pigments, spread over millions of years, were required for humans to evolve from a primitive mammal with a dim, shadowy view of the world into a greater ape able to see all the colors in a rainbow.Now, after more than two decades of painstaking research, scientists have finished a detailed and complete picture of the
There is a running joke in America that there are three times as many people in the U.S. claiming to be Irish as there are actual people in Ireland.
Though it's nice to claim to be Irish because of a last name, America is a melting pot. And it is so melted that the genetic ancestry of racial and ethnic groups varies significantly even across different geographic regions in the United States. A paper in the American Journal of Human Genetics, researchers analyzed the genomes of more than