Artificial daylight made by Tesla (1899)

The promise made by Nikola Tesla to the world some two years ago that he would soon give it a means of lighting its homes, its offices and its streets at night time by “artificial daylight” has been fulfilled.

Meet Clyde Tombaugh, discoverer of Pluto (1930)

Because of the discovery made by this young farmer of Kansas, every dictionary in the world will have to be revised. For all time to come, students of astronomy will read that the ninth planet, Pluto, was discovered in 1930 by Clyde Tombaugh.

Moon landing video & transcript (1969)

With more than half a billion people watching on television, Neil Armstrong climbs down the ladder and proclaims, "That's one small step for a man, one giant leap for mankind."