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On This Day

  • 10-20-1632

    Christopher Wren, noted architect and mathematician, born in Wiltshire, England. In 1673 he was the first to find the arclength of one branch of the cycloid.

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    Christopher Wren
    Cycloids
  • 10-20-1975

    Public Record Office in London released information on the Colossus, one of the first programmable electronic digital computers. It was built in 1943 for work on cryptography during World War II.

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    The Colossus Computer
  • 10-20-1984

    Paul Dirac, physicist, died in Tallahassee, Florida. A Nobel Prize winner in 1933, he is famous for unifying quantum mechanics and relativity theory.

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    Paul Dirac

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