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Chronology

  1. 1687

    Newton's Principia Mathematica

    Newton showed that one mathematical law of gravitation governs falling apples and orbiting moons — with the calculus-like methods to prove it.

  2. 1991

    A student posts a hobby operating system

    Linus Torvalds announced Linux 'just a hobby, won't be big and professional'; combined with GNU and the open-source method, it became the world's infrastructure.