The Guardian has a great profile of Robert Trivers, who as a graduate student in the 1970s became one of the most eloquent writers about evolution. My favorite part:
Despite his history degree, it was obvious to his supervisors that he knew little about human biology, so he was given the animals to write about, and started to learn modern Darwinian biology. He fell in love with the logic of evolution. In the flow of genes through generations, and the steady, inexorable shaping of behaviour by natural selection, he saw a geometry of time, as beautiful as the geometry of space that Newton and Galileo had discovered.
Read the whole thing. Hat tip: aldaily