June 21st |
1781 | Siméon-Denis Poisson, French mathematician and physicist, was born. |
1811 | Carlo Matteucci, Italian physicist, was born. |
1870 | Clara Immerwahr, German chemist, was born. |
1906 | M. S. Tswett submitted the first paper on chromatography; "Physico-chemical studies on chlorophyll. Adsorption behavior", to the Journal of the German Botanical Society. |