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Numerous astronauts and National Aeronautics and Space Administration (NASA) administrators spent time at Tech; most notably Retired Vice Admiral Richard H Truly was the eighth administrator of NASA and later served as the president of the Georgia Tech Research Institute John Young walked on the moon as the commander of Apollo 16 first commander of the space shuttle and is the only person to have piloted four different classes of spacecraft Georgia Tech has its fair share of noteworthy engineers scientists and inventors Nobel Laureate Kary Mullis developed the polymerase chain reaction Herbert Saffir developed the Saffir-Simpson Hurricane Scale and W Jason Morgan made significant contributions to the theory of plate tectonics and geodynamics in computer science Krishna Bharat developed Google News and D Richard Hipp developed SQLite Architect Michael Arad designed the World Trade Center Memorial in New York City, Slavery was legal and practiced in all of the Thirteen Colonies in most places it involved house servants or farm workers it was of economic importance in the export-oriented tobacco plantations of Virginia and Maryland and on the rice and indigo plantations of South Carolina About 287,000 slaves were imported into the Thirteen Colonies over a period of 160 years or 2% of the estimated 12 million taken from Africa to the Americas via the Atlantic slave trade the great majority went to sugar colonies in the Caribbean and to Brazil where life expectancy was short and the numbers had to be continually replenished By the mid-18th century life expectancy was much higher in the American colonies. 58/14 87/31 Places with 50,000 to 74,999 inhabitants, Although humid subtropical climates in Asia are mostly confined to the southeastern quarter of the continent there are two narrow areas along the coast of the Caspian Sea and Black Sea with humid subtropical climates Summers in these locations are cooler than typical humid subtropical climates and snowfall in winter is relatively common but is usually of a short duration. . !
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