Wednesday's Nobel Prize in chemistry was a historic first for women. It was the first time a Nobel science prize was given to more than one woman, but no men, in a specific category. In the 120 years of Nobel prizes in medicine, physics and chemistry, prizes were awarded 599 times to men and 23 times to women. Three other times, a woman won one of the sciences by herself. This year, Emmanuelle Charpentier and Jennifer Doudna won the chemistry prize for developing the CRISPR method of genome editing.