Sixfold
61Amtrak — For other uses, see Amtrak (disambiguation). Amtrak Map of the Amtrak system (2007) Reporting mark …
62Symmetry — For other uses, see Symmetry (disambiguation) …
63Stock market crash — A stock market crash is a sudden dramatic decline of stock prices across a significant cross section of a stock market, resulting in a significant loss of paper wealth. Crashes are driven by panic as much as by underlying economic factors. They… …
64Three Gorges Dam — Three Gorges Dam …
65Demographics of South Africa — Population of South Africa, 1961–2008 Population: 49,991,300 (July 2010 est.)[1] Growth rate …
66Economic growth — GDP real growth rates, 1990–1998 and 1990–2006, in selected countries …
67Inflammation — Toes inflamed by Chilblains Inflammation (Latin, īnflammō, “I ignite, set alight”) is part of the complex biological response of vascular tissues to harmful stimuli, such as pathogens, damaged cells, or irritants …
68Ignaz Semmelweis — Dr. Ignaz Semmelweis, aged 42 in 1860 pen sketch by Jenő Dopy …
69Metalloid —   13 14 15 16 17   2  B Boron …
70Institutional Revolutionary Party — Partido Revolucionario Institucional Leader Humberto Moreira Founded …
