So what are these?
Events
1882 - Robert Koch announces the discovery of the bacterium responsible for tuberculosis (mycobacterium tuberculosis; seen above
in culture).
1965 - Ranger 9, equipped to convert its signals into a form suitable for showing on domestic television, brings images of the Moon into ordinary homes
Births
1490 - Georg Agricola, German scientist
1809 - Joseph Liouville, French mathematician
1820 - A. E. Becquerel, French physicist
1834 - John Wesley Powell, American explorer and environmentalist
1884 - Peter Debye, Dutch chemist, Nobel laureate
1893 - Walter Baade, German astronomer
1917 - John Kendrew, British molecular biologist, Nobel laureate
1936 - David Suzuki, Canadian environmentalist
1945 - Robert T. Bakker, American paleontologist
Deaths
1881 - Joseph Delesse, French geologist
1962 - Auguste Piccard, Swiss physicist and explorer
2002 - César Milstein, Argentine scientist, recipient of the Nobel Prize in Physiology or Medicine