Template:Selected anniversaries/July 23
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1754: Joseph-Louis Lagrange publishes his first work, in the form of a letter in Italian. A month later he realized that he had rediscovered Leibniz's formula for the nth derivative of a product.
1829: William Austin Burt patents the typographer, a precursor to the typewriter.
1928: Astronomer and academic Vera Rubin born. She will discover the discrepancy between the predicted angular motion of galaxies and the observed motion, by studying galactic rotation curves.
1962: Telstar relays the first publicly transmitted, live trans-Atlantic television program, featuring Walter Cronkite.