to have originated
41AIDS origin — HIV, the infectious agent that causes AIDS, is thought to have originated in non human primates in sub Saharan Africa and to have been transferred to humans during the 20th century.Two species of HIV infect humans: HIV 1 and HIV 2. HIV 2 may have …
42Theories of religion — can be divided into substantive theories (focusing on what religion is) and functional or reductionist theories (focusing on what it does). Influential substantive theories have been proposed by Tylor and Frazer (focusing on the explanatory value …
43Stone Age — the period in the history of humankind, preceding the Bronze Age and the Iron Age, and marked by the use of stone implements and weapons: subdivided into the Paleolithic, Mesolithic, and Neolithic periods. [1860 65] * * * First known period of… …
44United Kingdom — a kingdom in NW Europe, consisting of Great Britain and Northern Ireland: formerly comprising Great Britain and Ireland 1801 1922. 58,610,182; 94,242 sq. mi. (244,100 sq. km). Cap.: London. Abbr.: U.K. Official name, United Kingdom of Great… …
45Computers and Information Systems — ▪ 2009 Introduction Smartphone: The New Computer. The market for the smartphone in reality a handheld computer for Web browsing, e mail, music, and video that was integrated with a cellular telephone continued to grow in 2008. According to… …
46List of Doctor Who universe creatures and aliens — This is a list of fictional creatures and aliens from the universe of the long running BBC science fiction television series Doctor Who, including Torchwood, The Sarah Jane Adventures and K 9. It covers alien races and other fictional creatures,… …
47Halloween — This article is about the holiday. For other uses, see Halloween (disambiguation). Halloween All Hallows Eve …
48Article One of the United States Constitution — United States of America This article is part of the series: United States Constitution Original text of the Constitution Preamble Articles of the Constitution I  …
49Asteroid belt — For the album by Velvet Chain, see Asteroid Belt (album). The asteroid belt (shown in white) is located between the orbits of Mars and Jupiter. The asteroid belt is the region of the Solar System located roughly between the orbits of the planets… …
50mathematics — /math euh mat iks/, n. 1. (used with a sing. v.) the systematic treatment of magnitude, relationships between figures and forms, and relations between quantities expressed symbolically. 2. (used with a sing. or pl. v.) mathematical procedures,… …
