A Chinese-American physicist whose name many people have never heard will soon share a rare honor typically bestowed on the field’s mononymous greats: Einstein, Fermi, Feynman. On 11 February, the International Day of Women and Girls in Science, the U.S. Postal Service (USPS) will issue a stamp commemorating Chien-Shiung Wu, the service announced this week. In 1956, Wu proved, essentially, that the universe knows its right hand from its left.