Hoover Dam from an airplane

According to the interwebs (which never lie), hard hats were created by the construction workers who built the Hoover Dam. During its construction in the 1930s, the Hoover Dam laborers dipped hats in tar and then allowed them to dry. Once set, the tarred headgear was nicknamed “hard boiled hats”, and later shortened to “hard hats.”

Big thanks to Autumn for the dam picture. (Har har.)

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