Construction workers hard hats were first invented and used in the building of the Hoover Dam in 1933.

On April 6, 1925, the first in-flight movie was shown. It was a silent film and appeared on a Deutsche Luft Hansa flight.

The term "mayday" used for signaling for help (after SOS) comes from the French "Maidez" which is pronounced "MAYDAY" and means, "Help Me."

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