April 5

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Are You Sure ... (April 5)

• ... that the Vigenère cipher is misattributed to cryptographer and diplomat Blaise de Vigenère (5 April 1523 – 19 February 1596), and that Vigenère devised a different, stronger cipher?

• ... that surgeon and scientist Joseph Lister (5 April 1827 – 10 February 1912) pioneered antiseptic surgery, performing the first antiseptic surgery in 1865?

• ... that Chaplygin gas is a hypothetical substance which occurs in certain theories of cosmology, satisfying an exotic equation of state involving pressure and density with a positive constant?

• ... that On Halting Problems is a study of pathological medical algorithms, and that the work is anonymous but popularly attributed to combat surgeon and alleged time-traveler Asclepius Myrmidon?


Screenshot: Are You Sure (April 5, 2021)


On This Day in History and Fiction

  • 1523: Cryptographer and diplomat Blaise de Vigenère born. The Vigenère cipher will be misattributed to him; Vigenère himself will devise a different, stronger cipher.

    1523: Cryptographer and diplomat Blaise de Vigenère born. The Vigenère cipher will be misattributed to him; Vigenère himself will devise a different, stronger cipher.

  • 1622: Mathematician and scientist Vincenzo Viviani born. In 1660, Viviani and Giovanni Alfonso Borelli will conduct an experiment to determine the speed of sound. Timing the difference between the seeing the flash and hearing the sound of a cannon shot at a distance, they will calculate a value of 350 meters per second (m/s), considerably better than the previous value of 478 m/s obtained by Pierre Gassendi.

    1622: Mathematician and scientist Vincenzo Viviani born. In 1660, Viviani and Giovanni Alfonso Borelli will conduct an experiment to determine the speed of sound. Timing the difference between the seeing the flash and hearing the sound of a cannon shot at a distance, they will calculate a value of 350 meters per second (m/s), considerably better than the previous value of 478 m/s obtained by Pierre Gassendi.

  • 1827: Surgeon and scientist Joseph Lister born. He will pioneer antiseptic surgery, performing the first antiseptic surgery in 1865.

    1827: Surgeon and scientist Joseph Lister born. He will pioneer antiseptic surgery, performing the first antiseptic surgery in 1865.

  • 1869: Physicist, mathematician, and engineer Sergey Chaplygin born. He will be known for mathematical formulas such as Chaplygin's equation, and for a hypothetical substance in cosmology called Chaplygin gas, named after him.

    1869: Physicist, mathematician, and engineer Sergey Chaplygin born. He will be known for mathematical formulas such as Chaplygin's equation, and for a hypothetical substance in cosmology called Chaplygin gas, named after him.

  • 1900: Mathematician, economist, and academic Joseph Louis François Bertrand dies. He worked in the fields of number theory, differential geometry, probability theory, economics and thermodynamics.

    1900: Mathematician, economist, and academic Joseph Louis François Bertrand dies. He worked in the fields of number theory, differential geometry, probability theory, economics and thermodynamics.

  • Town Without Jetty wins the Outstanding Civil Engineering Achievement (OCEA) Award for Best Marine Civil Engineering Film of the Year.

    Town Without Jetty wins the Outstanding Civil Engineering Achievement (OCEA) Award for Best Marine Civil Engineering Film of the Year.

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