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.