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
History of same-sex marriage in the United States states to issue marriage licenses to same-sex couples and to recognize same-sex marriages validly performed in other jurisdictions. This held all state same-sex marriage bans to be unconstitutional and legalized same-sex marriage in all remaining states. The decision came on the second anniversary of the "United States v. Windsor" ruling that struck down Section 3 of the Defense of Marriage Act (DOMA), which denied federal recognition of same-sex marriages. It also came on the twelfth anniversary of "Lawrence v. Texas" which struck down sodomy laws in 13 states. Each justice's opinion on "Obergefell" was consistent with their opinion in "Windsor".