Stanislao Cannizzaro in Italy. He is best known for his contribution to the then-existing debate over atoms, molecules, and atomic weights. He championed Amedeo Avogadro's notion that equal volumes of gas at the same pressure and temperature held equal numbers of molecules or atoms, and the notion that equal volumes of gas could be used to calculate atomic weights. In so doing, Cannizzaro provided a new understanding of chemistry. Stanislao Cannizzaro Stanislao Cannizzaro FRS (13 July 1826 – 10 May 1910) was an Italian chemist. He is remembered today largely for the Cannizzaro reaction and for his influential role in the atomic-weight
History of same-sex marriage in the United States voters approved a constitutional amendment banning same-sex marriage as well as all other types of same-sex unions. In the regular November 2012 elections, voters for the first time approved the legalization of same-sex marriage by popular vote in three states: Maine, Maryland, and Washington. Maine's law took effect on December 29, 2012. Maryland started allowing same-sex marriages on January 1, 2013, In Washington state, the first licenses were distributed on December 6, with the first marriages on December 9 following the mandatory three-day waiting period. In the same election, Minnesota rejected a constitutional ban on same-sex marriage. On June 26,