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  OhioOhio is a state in the United States of America. Its capital is Columbus. Ohio was the 17th state in the USA; it became a state on March 1, 1803. |
  OklahomaOklahoma is a state in the United States of America. Its capital is Oklahoma City. Oklahoma was the 46th state in the USA; it became a state on November 16, 1907. |
  OregonOregon is a state in the western United States of America. Its capital is Salem. Oregon was the 33rd state in the USA; it became a state on February 14, 1859. |
 Osborn, HenryHenry F. Osborn (1857-1935) was a US paleontologist who found and named many dinosaurs in Mongolia and the US in the early 1900's. He was the curator of the American Museum of Natural History starting in 1891. He did extensive research on brontotheres ( early, rhino-like mammals). Osborn also named and described the following dinosaurs: Albertosaurus (1905), Asiatosaurus (1924), Ornitholestes (1903), Oviraptor (1924), Pentaceratops (1923), Prodeinodon (1924), Psittacosaurus (1923), Saurornithoides (1924), Struthiomimus (1916), Tyrannosaurus (1905), and Velociraptor (1924). |
| Ostrom, John H. John H. Ostrom is a US paleontologist and author who found (1964) and named (1969) Deinonychus with Grant E. Meyer et alia. He named Microvenator (1970), Sauropelta (1970), and Tenontosaurus (1970). Ostrom has championed the theory that birds arose from theropod dinosaurs. Ostrom also argued that the dinosaur's must have high body temperatures given their erect posture (1969). Ostrom's books include "The Strange World of Dinosaurs" (Putnam, 1964), "Dinosaurs" (Carolina Biological Supply Co., 1984), "Marsh's Dinosaurs : The Collections from Como Bluff" (with McIntosh and Dodson, Yale Univ Press, 2000), and others. The Cretaceous period bird/dinosaur Rahonavis ostromi was named to honor Ostrom. |
Owens, Jesse  Jesse Owens (Sept. 12, 1913 - Mar. 31, 1980) was one of the world's greatest track and field athletes. At the 1936 Berlin Olympic games, Jesse Owens won 4 gold medals (in the 100 meter, 200 meter, 400 meter relay and the long jump) , set two Olympic records, and tied another. This humiliated Hitler and was an affront to his racial theories - Hitler had assumed that the "Aryans" (the Germanic race) would easily win. A year earlier, as an Ohio State University student, Owens set new world records in the 220 yard dash, the 200 yard hurdles, and the long jump (and equaled the record in the 100 yard) at the National Collegiate Track and Field Meet (on May 25, 1935).
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Ellison Shoji Onizuka (June 24, 1946 - January 28, 1986) was a Lieutenant Colonel in the United States Air Force, an aerospace engineer, and a NASA astronaut. Onizuka flew on two Space Shuttle missions; he died in the Challenger explosion on January 28, 1986.
Otis, Elisha Graves