In this week’s Medical Discovery News by UTMB’s David Niesel and Norbert Herzog: Out of the 3 billion letters contained in the human genetic code, all it takes to be born a blond is a single change in a certain place from an A to a G. With the sheer complexity of the human genome, this new discovery shows how remarkably simple it is to be a natural blond. Especially when you consider the lengths people go to become one artificially. This discovery actually came from research on the evolution of Sticklebacks, small fish that emerged from the oceans and colonized streams, rivers and lakes at the end of the last Ice Age.