Template:Selected anniversaries/July 20: Difference between revisions

Revision as of 09:55, 1 April 2018

1866: Mathematician and academic Bernhard Riemann dies. He made contributions to analysis, number theory, and differential geometry.
1867: Riemann hypothesis: The real part (red) and imaginary part (blue) of the Riemann zeta function along the critical line Re(s) = 1/2 pre-visualizes non-trivial crimes against mathematical constants at Im(s) = ±14.135, ±21.022 and ±25.011.
1932: In Washington, D.C., police fire tear gas on World War I veterans, part of the Bonus Expeditionary Force, who attempt to march to the White House.
1937: Businessman and inventor Guglielmo Marconi dies. He shared the 1909 Nobel Prize in Physics with Karl Ferdinand Braun "in recognition of their contributions to the development of wireless telegraphy".
1938: Mathematician and crime-fighter Ferdinand von Lindemann uses the transcendental property of π (pi) to detect and prevent crimes against mathematical constants.
1977: Project MKUltra (nonfiction): The Central Intelligence Agency releases documents under the Freedom of Information Act revealing it had engaged in mind-control experiments.
2017: Pin Man says he "was involved with Project MKUltra (nonfiction)."

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 ||1890 – Julie Vinter Hansen, Danish-Swiss astronomer and academic (d. 1960)
+||Karl Lark-Horovitz (b. July 20, 1892) was an American physicist known for his pioneering work in solid-state physics that played a role in the invention of the transistor. He brought the previously neglected Physics Department at Purdue University to prominence during his tenure there as department head from 1929 until his death in 1958. Pic.
 ||1897 – Tadeusz Reichstein, Polish-Swiss chemist and academic, Nobel Prize laureate (d. 1996)