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On This Day

  • 2-5-1575

    Jan De Groot entered the University of Leiden, in the Netherlands, on its opening day. With Stevin he later performed an experiment proving that bodies of different weights fall the same distance in the same time (published in 1586 by Stevin). This anti-Aristotelian experiment anticipated Galileo's famous, but apocryphal, experiment at the Leaning Tower of Pisa. His son Hugo de Groot was a famous jurist.

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    Jan de Groot
  • 2-5-1676

    Newton wrote Hooke: "What Descartes did was a good step .... If I have seen further it is by standing on the shoulders of Giants."

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    Isaac Newton
    Rene Descartes
  • 2-5-1772

    Laplace presented his first probability memoir to the Academie des Sciences.

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    Pierre-Simon Laplace