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Nikolai Kardashev
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Nikolai Semenovich Kardashev (born April 25, 1932 in Moscow) is a Russian (formerly Soviet) astrophysicist, and is the deputy director of the Russian Space Research Institute (sometimes translated as The Institute for Cosmic Research) of the Russian Academy of Sciences in Moscow. [url=http:...
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Richard van der Riet Woolley (1906-86)
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Richard van der Riet Woolley FRS (24 April 1906 - 24 December 1986) was an English astronomer who became Astronomer Royal. His mother's maiden name was Van der Riet. Read more
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Immanuel Kant (1724 - 1804)
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Immanuel Kant (22 April 1724 - 12 February 1804) was a German philosopher. He is the central figure of modern philosophy, and set the terms by which all subsequent thinkers have had to grapple. Read more
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George Kalmus
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George Ernest Kalmus, CBE, FRS (born 21 April 1935) is a British particle physicist. Read more
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Gerald Stanley Hawkins (1928-2003)
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Gerald Stanley Hawkins (1928-2003) was an English astronomer and author most famous for his work in the field of archaeoastronomy. A professor and chair of the astronomy department at Boston University in the United States. In 1965 he published an analysis of Stonehenge in which he was the first to...
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Erich Hartmann (1922 - 1993)
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Erich Alfred Hartmann (19 April 1922 - 20 September 1993), nicknamed "Bubi" (the hypocoristic form of "young boy") by his comrades and "The Black Devil" by his Soviet adversaries, was a German fighter pilot during World War II and is the highest-scoring fighter a...
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Kimberly Ann Weaver
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Kimberly Weaver, astrophysicist, Inspiring West Virginian Kimberly Ann Weaver, 47, grew up in Monongalia County, WV, and is an astrophysicist at the Goddard Space Flight Centre. The sprawling campus encompasses nearly 1300 acres. More scientists and engineers work here than anywhere else in t...
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Keith Mason
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Keith Mason (born 19 April 1951) was, until 1 November 2011, the Chief Executive of the Science and Technology Facilities Council (STFC) of the United Kingdom. Read more
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Hans-Emil Lau (1879 - 1918)
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Hans-Emil Lau (April 16, 1879 - October 16, 1918) was a Danish astronomer. He is most famous for his work on Mars and Jupiter. Other areas he worked on were star parallax, the measuring of variable stars, the colour of stars, and the observation of comets, sunspots, and the ring of Saturn. He died prema...
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Owain Glyndŵr (1349 or 1359 - 1416)
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Owain Glyndr or Owain Glyn Dr, (c. 1349 or 1359 - c. 1416) was a Welsh ruler and the last native Welshman to hold the title Prince of Wales (Tywysog Cymru). He instigated a fierce and long-running but ultimately unsuccessful revolt against the English rule of Wales. [url=http://en.wikipedia.org/w...
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Canon J. Silas Evans (1864-1953)
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John Silas Evans is notable as an author of popular astronomical books, in particular for writing the Welsh language classic Seryddiaeth a Seryddwyr. Canon Evans was a prominent Churchman and was Vicar of Llanrhaeadr-ym-Mochnant for nearly three decades. Silas Evans was born on 11th March, 1864...
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Abdullah Atalar
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Abdullah Atalar (born April 11, 1954) is a Turkish scientist and academic. Atalar is the Rector of Bilkent University, and a professor at Department of Electrical and Electronics Engineering. Read more
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Lev Bulat
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'Lev Petrovich Bulat, a Russian physicist, was born on April 11, 1947, Chernovtsy, Ukraine. In 1988 he received a D.Sc in Physics and Mathematics, from Leningrad Polytechnical Institute, with the thesis: "Transport Phenomena in Semiconductors under Large Temperature Gradients"....
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Macedonio Melloni (1798 - 1854)
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Macedonio Melloni (11 April 1798 - 11 August 1854) was an Italian physicist, notable for demonstrating that radiant heat has similar physical properties to those of light. Read more
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Heinrich Erfle (1884 - 1923
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Heinrich Valentin Erfle (born 1 April 1884 in Durkheim, died 8 April 1923 in Jena) was a German optician. He developed in 1917 the first wide-angle eyepieces for telescopes and binoculars. Read less
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