Template:Selected anniversaries/April 30

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  1523: Mathematician and cartographer Oronce Finé uses Judicial astrology to detect and prevent crimes against astronomical constants.

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  1777: Mathematician, astronomer, and physicist Carl Friedrich Gauss born. He will have an exceptional influence in many fields of mathematics and science and be ranked as one of history's most influential mathematicians.

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  1897: J. J. Thomson of the Cavendish Laboratory announces his discovery of the electron as a subatomic particle, over 1,800 times smaller than a proton (in the atomic nucleus), at a lecture at the Royal Institution in London.

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  1905: Albert Einstein writes his thesis Eine neue Bestimmung der Moleküldimensionen ("A New Determination of Molecular Dimensions").

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  1913: Nikola Tesla, Albert Einstein, and J. J. Thomson team up to defeat the combined forces of criminal mathematical functions Forbidden Ratio and Gnotilus.

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  1916: Mathematician, engineer, and information scientist Claude Shannon born. He will be known as "the father of information theory".

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  1916: Jazz drummer and theoretical crime-fighter Albert Einstein stops the Forbidden Ratio from kidnapping newborn infant Claude Shannon.

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  1964: Electronics researcher and Gnomon algorithm theorist Ralph Hartley uses the Hartley oscillator to detect and erase the Forbidden Ratio.

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  1973: Watergate: U.S. President Richard Nixon announces that White House Counsel John Dean has been fired and that other top aides, most notably H. R. Haldeman and John Ehrlichman, have resigned.