The Mississippi River is rocked by earthquakes, Baltimore burns, Chaplin debuts "The Tramp," The Beatles arrive in America, and space shuttle astronauts make the first untethered spacewalk, all on this day.
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NASA
1984: Space shuttle Challenger astronauts Bruce McCandless II and Robert L. Stewart make the first untethered space walk using the Manned Maneuvering Unit, a propulsion unit strapped to their backs.