Fidel Castro (Wikiquote)Fidel Alejandro Castro Ruz (13 August 1926 – 25 November 2016) was a Cuban politician and communist revolutionary who governed the Republic of Cuba as First Secretary of the Communist Party of Cuba from 1961 to 2011, Prime Minister from 1959 to 1976 and then as President from 1976 to 2008. A Marxist–Leninist and Cuban nationalist, Castro also served as the First Secretary of the Communist Party of Cuba from 1961 until 2011. Under his administration, Cuba became a one-party communist state, while industry and business were nationalized and state socialist reforms were implemented throughout society.
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Russell’s paradox (Wikipedia)In mathematical logic, Russell’s paradox (also known as Russell’s antinomy) is a set-theoretic paradox published by the British philosopher and mathematician Bertrand Russell in 1901. Russell’s paradox shows that every set theory that contains an unrestricted comprehension principle leads to contradictions. The paradox had already been discovered independently in 1899 by the German mathematician Ernst Zermelo. However, Zermelo did not publish the idea, which remained known only to David Hilbert, Edmund Husserl, and other academics at the University of Göttingen. At the end of the 1890s, Georg Cantor – considered the founder of modern set theory – had already realized that his theory would lead to a contradiction, as he told Hilbert and Richard Dedekind by letter.