1638 - Death of Claude Gaspard Bachet de Méziriac, French mathematician
1786 - Birth of François Arago, French mathematician
1799 - Birth of Émile Clapeyron, French engineer and physicist
1814 - Birth of Charles Joseph Sainte-Claire Deville, French geologist
1935 - Robert Watson-Watt carried out a demonstration near Daventry which led directly to the development of RADAR in the United Kingdom.
1852 - Birth of John Harvey Kellogg,American surgeon, advocate of dietary reform
1857 - Birth of Émile Coué, French psychologist
1903 - Birth of Giulio Natta, Italian chemist, Nobel Prize laureate
1931 - Death of Otto Wallach, German chemist, Nobel Prize laureate
1946 - Birth of Ahmed H. Zewail, Egyptian chemist, Nobel Prize laureate
1991 - Tim Berners-Lee introduces WorldWideWeb, the first web browser.