December 15th
1780 Johann W. Döbereiner, who postulated the theory of triads showing periodicity in the elements; researcher on catalytic action of platinum; invented instantaneous lighting lamp (Döbereiner lamp), was born.
1852 Antoine H Becquerel, who discovered radiation from uranium salts, was born. In 1903 he won the Nobel Prize in Physics in recognition of the extraordinary services he has rendered by his discovery of spontaneous radioactivity.