Amedeo Avogadro Amedeo Avogadro Amedeo Carlo Avogadro, () Count of Quaregna and Cerreto (9 August 17769 July 1856), was an Italian scientist, most noted for his contribution to molecular theory now known as Avogadro's law, which states that equal volumes of gases under the same conditions of temperature and pressure will contain equal numbers of molecules. In tribute to him, the number of elementary entities (atoms, molecules, ions or other particles) in 1 mole of a substance, , is known as the Avogadro constant, one of the seven SI base units and represented by "N". Lorenzo Romano Amedeo Carlo Avogadro was born
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,