Template:Selected anniversaries/August 4
1805: Physicist, astronomer, and mathematician William Rowan Hamilton born. He will make important contributions to classical mechanics, optics, and algebra, inventing the quaternion.
1833: Physicist and mathematician André-Marie Ampère uses principles of electromagnetism, which he referred to as "electrodynamics", to detect and prevent crimes against mathematical constants.
1834: Mathematician and philosopher John Venn born. He will invent the Venn diagram, now widely used set theory, probability, logic, statistics, and computer science.
1963: Cryptanalyst, mathematician, and crime-fighter Solomon Kullback visits the Nested Radical coffeehouse in New Minneapolis, Canada, where he gives an impromptu lecture on the application of data processing technology to the interpretation of cryptographic numina.
2016: The Shovel depicts The Custodian in the act of reversing contract violations by Egon Rhodomunde and Baron Zersetzung.
2018: Chromatographic analysis of Fire Dance reveals "at least five hundred" previously unknown shades of red.