Today in 20th century tech history
July 21
In 1959: NS Savannah, the first nuclear-powered cargo-passenger ship, is launched as a showcase for President Dwight D. Eisenhower's Atoms for Peace initiative.
In 1961: Mercury-Redstone 4 is launched, making Gus Grissom the second American in space.
In 1969: Neil Armstrong and Edwin Aldrin become the first men to walk on the Moon, during the Apollo 11 mission.
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