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| Jansky, Karl Karl G. Jansky (1905-1949) was an American radio engineer who pioneered and developed radio astronomy. In 1932, he detected the first radio waves from a cosmic source - in the central region of the Milky Way Galaxy. |
 Jefferson, ThomasThomas Jefferson (1743-1826) wrote the Declaration of Independence and was the third president of the USA, serving from 1801 to 1809. |
| Jensen, James A. James A. Jensen is a US paleontologist from Brigham Young University who discovered Supersaurus (1972) and Ultrasauros (1979). He named Cathetosaurus (1988), Dystylosaurus (1985), the family Torvosauridae (1985), and Torvosaurus (with P.M. Galton, 1979). |
 Jansky, KarlKarl Gothe Jansky (1905-1949) was an American radio engineer who pioneered and developed radio astronomy. In 1932, he detected the first radio waves from a cosmic source - in the central region of the Milky Way Galaxy. |
| Joliet, Louis Louis Joliet (1645-1700) was a Canadian explorer (born in Québec City) who explored the Canadian wilderness, including the Great Lakes area. He and Father Jacques Marquette found the Mississippi River in 1673; they were the first Caucasians to see the Mississippi River. Together, they travelled along Lake Michigan to Green Bay, canoed up the Fox River, and went downstream on the Wisconsin River to the Mississippi River. They travelled almost to the mouth of the Arkansas, and then stopped because they were warned of hostile Indians and Spanish explorers. They returned via the Illinois River, then the Chicago River to Lake Michigan. Joliet's journal and his maps were lost when his canoe overturned on the rapids of the Montreal River. Marquette's diary is all that remains of their journey. Joliet expanded fur trade westward, did extensive mapping, and established a fort on Anticosti Island. |
Joplin, Scott Scott Joplin (1868-1917) was a great composer and pianist. As a boy in Texarkana, Texas, Joplin taught himslef to play the piano. He played and composed ragtime music, a lively, unique genre. He composed over 60 pieces (most for piano), including the "Maple Leaf Rag" and "The Entertainer," which are still popular today. Joplin also wrote two operas. |
Jordan, Barbara Barbara Jordan (Feb. 21, 1936-Jan. 17, 1996) was the first black U.S. congresswoman from the deep South; she served Texas for six years in the US House of Representatives. Jordan was a powerful orator who fought for civil rights and the rights of the poor. |
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Mae C. Jemison (October 17, 1956 - ) was the first African-American woman in space. Dr. Jemison is a medical doctor and a surgeon, with engineering experience. She flew on the space shuttle Endeavor (STS-47, Spacelab-J) as the Mission Specialist; the mission lifted off on September 12, 1992 and landed on September 20, 1992.
James, Richard
Judson, Whitcomb L.