Hyman Lipman patented the pencil with an eraser on top.
His patent included a metal ferrule to keep the eraser in place.
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An orbital-class rocket was successfully reused for the first time.
The US adopted the 15th Amendment, guaranteeing citizens the right to vote.
North Carolina repealed its controversial bathroom law that restricted transgender use.
Swimmer Michael Phelps smashed the world record for the 200-meter butterfly swim at just 15 years old.
The Heinkel He 100 fighter set a world airspeed record of 463 mph (745 km/h).