Died This Day: Hermann Muller
The father of radiation genetics, Muller (Dec. 21, 1890 – April 5, 1967) began his career with T.H. Morgan studying mutations in fruit flies. He was the first to increase the mutation rate using heat, later using 50 kilovolt X-rays to induce an even greater incidence of mutations. Muller was awarded the Nobel Prize for Physiology or Medicine in 1946.