12" Wooden Ruler made in U.S.A. of American-grown basswood. Women on this ruler worked (or continue to work) in fields as diverse as Astronomy, Mathematics, Medicine, Physics, Psychology, Biochemistry, Anthropology, Genetics, Ecology and Computer Science. We have tried to find individuals whose contributions were important to mankind, and who came from various time periods, regions of the world and educational backgrounds. The dates listed are the years of each scientist’s birth and death, if known. We also list the area of science in which they worked (or continue to work). If the scientist won a Nobel Prize, we list the year in which that happened. The “head” image is of Marie Curie (1867-1934), who became the first woman to win a Nobel prize in any discipline when she won the prize for Physics in 1903. She went on to win the Nobel Prize for Chemistry in 1911, making her the first person and only woman to win two Nobel Prizes.