September 29
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1512: Doctor, astronomer, and astrologer Johannes Engel dies. He published numerous almanacs, planetary tables, and calendars.
1901: Physicist Enrico Fermi born. He will be called the "architect of the nuclear age" and the "architect of the atomic bomb".
1957: Twenty MCi (740 petabecquerels) of radioactive material is released in an explosion at the Soviet Mayak nuclear plant at Chelyabinsk. See Kyshtym disaster (nonfiction).