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Smallpox was an infectious disease caused by variola virus (often called smallpox virus), which belongs to the genus Orthopoxvirus. [7] [11] The last naturally occurring case was diagnosed in October 1977, and the World Health Organization (WHO) certified the global eradication of the disease in 1980, [10] making smallpox the only human disease to have been eradicated to date.
Hydrochloric acid, also known as muriatic acid or spirits of salt, is an aqueous solution of hydrogen chloride (HCl). It is a colorless solution with a distinctive pungent smell.
ISBN 978-3-937903-10-1. Archived from the original on 9 December 2012. Photo book. Stange, Rolf (2012). Spitsbergen – Svalbard: A complete guide around the arctic archipelago. Rolf Stange. ISBN 978-3-937903-14-9. Archived from the original on 10 December 2012. Tjomsland, Audun & Wilsberg, Kjell (1995). Braathens SAFE 50 år: Mot alle odds. Oslo.
Pie chart showing the proportion of lurkers, contributors and creators under the 90–9–1 principle. In Internet culture, the 1% rule is a general rule of thumb pertaining to participation in an Internet community, stating that only 1% of the users of a website actively create new content, while the other 99% of the participants only lurk.
Hofstadter's law is a self-referential adage, coined by Douglas Hofstadter in his book Gödel, Escher, Bach: An Eternal Golden Braid (1979) to describe the widely experienced difficulty of accurately estimating the time it will take to complete tasks of substantial complexity: [1] [2]
Vienna (/ v i ˈ ɛ n ə / ⓘ vee-EN-ə; [9] [10] German: Wien ⓘ; Austro-Bavarian: Wean) is the capital, most populous city, and one of nine federal states of Austria.It is Austria's primate city, with just over two million inhabitants.