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J. Robert Oppenheimer -- b.4/22/1904 d.2/18/1967 (62)
Misc: head of the Manhattan (A-bomb) Project; creator of the nuclear bomb
Mathieu Orfila -- b.4/24/1787 d.3/12/1853 (65)
Chemist, French, Spanish
Misc: science of toxicology father
Hugh Orr -- b.1/2/1715 d.12/6/1798 (83)
Sir William Osler -- b.7/12/1849 d.12/29/1919 (70)
Author, Physician, Educator, Canadian
Misc: circulatory system
Wilhelm Friedrich Ostwald -- b.9/2/1853 d.4/4/1932 (78)
Philosopher, Chemist, German
Misc: Nobel 1909; He is, in the words of Asimov, "One of the chief founders of modern physical chemistry", The Nobel Prize was awarded; "in recognition of his work on catalysis and for his investigations into the fundamental principles governing chemical equilibria and rates of reaction"
Elisha Graves Otis -- b.8/3/1811 d.4/8/1861 (49)
Misc: developer of the first safe passenger elevator.
Nikolaus August Otto -- b.6/10/1832 d.1/26/1891 (58)
Misc: developed the four-stroke internal-combustion engine, which offered the first practical alternative to the steam engine as a power source.
William Oughtred -- b.3/5/1575 d.6/30/1660 (85)
Inventor, Mathematician, British
Misc: invented Slide Rules
Robert F. Overmyer -- b.7/14/1936 d.3/22/1996 (59)
Sir Richard Owen -- b.7/20/1804 d.12/18/1892 (88)
Scientist, Zoologist, English
Misc: created the word "Dinosaur" meaning "terrible reptile"
M. J. Owens -- b.1/1/1859 d.12/27/1923 (64)
Misc: an inventor of machines that could automate the production of glass bottles.
Dr. Mehmet Oz -- b.6/11/1960
Doctor, TV Host