Template:Selected anniversaries/October 21: Difference between revisions
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||1931 – The Sakurakai, a secret society in the Imperial Japanese Army, launches an abortive coup d'état attempt. | ||1931 – The Sakurakai, a secret society in the Imperial Japanese Army, launches an abortive coup d'état attempt. | ||
File:Martian face.jpg|link=Pareidolia (nonfiction)|1958: National [[Pareidolia (nonfiction)|Pareidolia]] Day declared in the United States. | |||
||1959 – In New York City, the Solomon R. Guggenheim Museum, designed by Frank Lloyd Wright, opens to the public. | ||1959 – In New York City, the Solomon R. Guggenheim Museum, designed by Frank Lloyd Wright, opens to the public. | ||
Revision as of 12:39, 21 October 2017
1914: Mathematics and science writer Martin Gardner born. His interests will include stage magic, scientific skepticism, philosophy, religion, and literature.
1958: National Pareidolia Day declared in the United States.
1969: Mathematician and academic Wacław Sierpiński dies. He made important contributions to set theory (research on the axiom of choice and the continuum hypothesis), number theory, theory of functions, and topology.
2017: Green Spiral 9 feels more green than ever, according to new chromatographic analysis.