History of chemistry 1808, certain of his central ideas were soon adopted by most chemists. However, uncertainty persisted for half a century about how atomic theory was to be configured and applied to concrete situations; chemists in different countries developed several different incompatible atomistic systems. A paper that suggested a way out of this difficult situation was published as early as 1811 by the Italian physicist Amedeo Avogadro (1776-1856), who hypothesized that equal volumes of gases at the same temperature and pressure contain equal numbers of molecules, from which it followed that relative molecular weights of any two gases are the same as
Same-sex unions in the United States law. The federal Defense of Marriage Act in 1996, prompted by fears of an adverse result in Hawaii's lawsuit "Baehr v. Miike", defined a marriage explicitly as a union of one man and one woman for the purposes of all federal laws (See ), which was ultimately ruled unconstitutional by the Supreme Court in "United States v. Windsor" on June 26, 2013. As a result, shortly after "Windsor" was decided, a number of federal areas ranging from veteran benefits to immigration were clarified as applying equally to same-sex couples. The movement to obtain civil marriage rights and benefits for same-sex