On April 24, 1990, the space shuttle Discovery blasted off from Cape Canaveral, Fla., carrying the $1.5 billion Hubble Space Telescope.
1800 Congress approved a bill establishing the Library of Congress.
1915 The Ottoman Empire rounded up Armenian political and cultural leaders in Constantinople at the start of what many scholars regard as the first genocide of the 20th century, in which an estimated 1.5 million Armenians died.
1962 The Massachusetts Institute of Technology achieved the first satellite relay of a television signal.
2005 Pope Benedict XVI was installed as leader of the Roman Catholic Church in ceremonies at the Vatican.
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