January 26th
1630 – Death of Henry Briggs, English mathematician
1697 – Death of Georg Mohr, Danish mathematician
1823 – Death of Edward Jenner, English physician
1904 – Birth of Ancel Keys, American scientist
1911 – Birth of Polykarp Kusch, German-born physicist, Nobel Prize Laureate
1942 – Death of Felix Hausdorff, German mathematician
1943 – Death of Harry H. Laughlin, American eugenicist
1943 – Death of Nikolai Vavilov, Russian botanist