Valentine's Day friend"), which is a game similar to the Christmas tradition of Secret Santa. In Brazil, the "Dia dos Namorados" (lit. "Lovers' Day", or "Boyfriends'/Girlfriends' Day") is celebrated on June 12, probably because that is the day before Saint Anthony's day, known there as the "marriage saint", when traditionally many single women perform popular rituals, called "simpatias", in order to find a good husband or boyfriend. Couples exchange gifts, chocolates, cards, and flower bouquets. The February 14 Valentine's Day is not celebrated at all because it usually falls too little before or too little after the Brazilian Carnival — that can
Joan S. Valentine Joan S. Valentine Joan Selverstone Valentine (born 1945) is a biological inorganic chemist and biochemist. Valentine's current work examines the role of transition metals, metalloenzymes, and oxidative stress in health. Her foremost expertise is superoxide anion and its functional enzyme superoxide dismutase. Valentine has been a member of the faculty of the University of California, Los Angeles since 1980, she has served as Editor-in-Chief of "Accounts of Chemical Research" since 1994, and she was elected to the National Academy of Sciences in 2005. In 1967, she graduated with a Bachelor of Arts in Chemistry from Smith College and a Ph.D.