Template:Selected anniversaries/April 27
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1880: Transdimensional corporation spontaneously generates four-dimensional bacteriophage.
1881: "Leipzig University should include me in seal," says Friedrich Nietzsche.
1913 – Irving Adler, American mathematician, author, and academic (d. 2012)
1932 – Gian-Carlo Rota, Italian-American mathematician and philosopher (d. 1999)
1936 – Karl Pearson, English mathematician and academic (b. 1857)
1938 – Edmund Husserl, Czech mathematician and philosopher (b. 1859)
1952 – Guido Castelnuovo, Italian mathematician and statistician (b. 1865)
1981 – Xerox PARC introduces the computer mouse.