Dorothy Crowfoot (Hodgkin, after her 1937 marriage) was born in Cairo, Egypt, to a pair of British archaeologists. She was sent home to England for school, where she was one of only two girls who were allowed to study chemistry with the boys. At 18, she enrolled in one of Oxford’s women’s colleges and studied chemistry and then moved to Cambridge to study X-ray crystallography, a type of imaging that uses X-rays to determine a molecule’s three-dimensional structure. She returned to Oxford in 1934, where she would spend most of her working life, teaching chemistry and using X-ray crystallography to study interesting biological molecules. She spent years perfecting the technique, for which she was awarded a Nobel Prize in 1964, and determined the structures of penicillin, vitamin B12 and insulin. In 2010, 16 years after her death, the British Royal Mail celebrated the 350th anniversary of the Royal Society by issuing stamps with the likenesses of 10 of the society’s most illustrious members, including Isaac Newton and Benjamin Franklin; Hodgkin was the only woman in the group.