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...n for the GPS system came when the Soviet Union launched the first Sputnik in 1957. A team of U.S. scientists led by Dr. Richard B. Kershner were monito ...o place accurate clocks in space, a technology the GPS system relies upon. In the 1970s, the ground-based Omega Navigation System, based on signal phase

...n for the GPS system came when the Soviet Union launched the first Sputnik in 1957. A team of U.S. scientists led by Dr. Richard B. Kershner were monito ...o place accurate clocks in space, a technology the GPS system relies upon. In the 1970s, the ground-based Omega Navigation System, based on signal phase

...money came into being and naming at least ten strange forms of money used in place of coins or currency. --> ...s want chickens, and apples were not always in season, so there were times in the year that I could not trade.

...money came into being and naming at least ten strange forms of money used in place of coins or currency. --> ...s want chickens, and apples were not always in season, so there were times in the year that I could not trade.

...he became the first Dorcas Society (Adventist Community Service) president in October, 1874. ...book, ''On The Trail of Livingston'' (1919) did much to stimulate interest in African Missions where he served for 50 years.

...he became the first Dorcas Society (Adventist Community Service) president in October, 1874. ...book, ''On The Trail of Livingston'' (1919) did much to stimulate interest in African Missions where he served for 50 years.