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 marriage law in the United States by state Puerto Rico." Texts: § 31. Nature of marriage. "Marriage is hereby declared to be a civil contract which may be entered into between a male and a female in accordance with law." State by state: Same-sex marriage law in the United States by state This article summarizes the same-sex marriage laws of states and similar jurisdictions in the United States. Via the case "Obergefell v. Hodges" on June 26, 2015, the Supreme Court of the United States legalized same-sex marriage in a decision that applies nationwide, with the possible exception of American Samoa and some tribal jurisdictions. Same-sex marriages are