He was a mathematician and an oceanographer................he was also into mechanical engineering..........he made America's 1st clock..............................made tables of the tides of the Chesapeake bay...........etc.........
Benjamin Banneker was a free African American almanac author, surveyor, naturalist and farmer. Born in Baltimore County, Maryland, to a free African American woman and a former slave, Banneker had little formal education and was largely self-taught.
Wikipedia
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