Events
1971 - Mariner 9 becomes the first spacecraft to orbit another planet (Mars). Though switched off on 27th October 1972, the probe is still in Mars orbit and stable until at least 2022.
Births
1924 - Motoo Kimura, Japanese geneticist (above)
Deaths
1606 - Geronimo Mercuriali, Italian philologist and physician
1994 - Motoo Kimura, Japanese geneticist
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