Greenwich Mean Time (GMT) is the mean solar time at the Royal Observatory in Greenwich, London, counted from midnight.

On July 20, 1969, Neil Armstrong became the first human to step on the moon. He and Aldrin walked around for three hours.

Galileo was a natural philosopher, astronomer, and mathematician. He also made revolutionary telescopic discoveries, including the four largest moons of Jupiter.

Satoshi Nakamoto is the name used by the presumed pseudonymous person or persons who developed bitcoin, authored the bitcoin white paper, and created and deployed bitcoin's original reference implementation.

Benjamin Holt was an American inventor who patented and manufactured the first practical crawler-type tread tractor.