February 21st
1554 - Death of Hieronymus Bock, German botanist
1721 - Birth of John McKinly, American physician
1895 - Birth of Carl Peter Henrik Dam Danish biochemist, Nobel laureate
1901 - Death of George Francis FitzGerald, Irish mathematician
1918 - The last Carolina parakeet dies in captivity at the Cincinnati Zoo.
1926 - Death of Heike Kamerlingh Onnes, Dutch physicist, Nobel Prize laureate
1938 - Death of George Ellery Hale, American astronomer
1953 - Francis Crick and James D. Watson discover the structure of DNA.
1968 - Death of Howard Walter Florey, Australian-born pharmocologist, recipient of the Nobel Prize in Physiology or Medicine
1999 - Death of Gertrude B. Elion, American scientist, recipient of the Nobel Prize in Physiology or Medicine
2002 - Death of Harold Furth, Austrian-born physicist
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1554 - Death of Hieronymus Bock, German botanist
Not to be confused with painter Hieronymus Bosch (1450-1516).