Template:On This Day (nonfiction)/May 30
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1423: Mathematician and astronomer Georg von Peuerbach born. He will be remembered for his streamlined presentation of Ptolemaic astronomy in the Theoricae Novae Planetarum.
1739: Jacques de Vaucanson demonstrates his Digesting Duck automaton for the first time.
1946: Physicist Louis Slotin dies. He was fatally irradiated in a criticality incident during an experiment with the demon core at Los Alamos National Laboratory.
1964: Physicist and academic Leo Szilard dies. He conceived the nuclear chain reaction in 1933, and patented the idea of a nuclear reactor with Enrico Fermi.
1971: NASA launches the Mariner 9 spacecraft. It will map 70% of the surface of Mars, and study temporal changes in the atmosphere and surface.