Template:Selected anniversaries/August 25

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  • 1609: Galileo Galilei demonstrates his first telescope to Venetian lawmakers.

    1609: Galileo Galilei demonstrates his first telescope to Venetian lawmakers.

  • 1699: Mathematician and mechanician Charles Étienne Louis Camus born. He will be the author of Cours de mathématiques (Paris, 1766), along with a number of essays on mathematical and mechanical subjects.

    1699: Mathematician and mechanician Charles Étienne Louis Camus born. He will be the author of Cours de mathématiques (Paris, 1766), along with a number of essays on mathematical and mechanical subjects.

  • 1819: inventor, engineer, and chemist James Watt dies. He made major improvements to the steam engine.

    1819: inventor, engineer, and chemist James Watt dies. He made major improvements to the steam engine.

  • 1934: Inventor Philo Farnsworth demonstrates his electronic television system to the public at the Franklin Institute in Philadelphia.

    1934: Inventor Philo Farnsworth demonstrates his electronic television system to the public at the Franklin Institute in Philadelphia.

  • 1948: The House Un-American Activities Committee holds first-ever televised congressional hearing: "Confrontation Day" between Whittaker Chambers and Alger Hiss.

    1948: The House Un-American Activities Committee holds first-ever televised congressional hearing: "Confrontation Day" between Whittaker Chambers and Alger Hiss.

  • 1965: Biochemist Hedley Ralph Marston dies. Marston's research into fallout from the British nuclear tests at Maralinga proved that significant radiation hazards existed at many of the Maralinga sites long after the tests.

    1965: Biochemist Hedley Ralph Marston dies. Marston's research into fallout from the British nuclear tests at Maralinga proved that significant radiation hazards existed at many of the Maralinga sites long after the tests.

  • 2012: Voyager 1 crossed the heliopause to become the first spacecraft to enter interstellar space and study the interstellar medium.

    2012: Voyager 1 crossed the heliopause to become the first spacecraft to enter interstellar space and study the interstellar medium.

  • 2016: Polymath George Spencer-Brown dies. Spencer-Brown wrote the unorthodox and influential Laws of Form, calling it the "primary algebra" and the "calculus of indications".

    2016: Polymath George Spencer-Brown dies. Spencer-Brown wrote the unorthodox and influential Laws of Form, calling it the "primary algebra" and the "calculus of indications".

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