Revolutionary inventions from the 1920s, including medical breakthroughs like insulin and everyday innovations like Band-Aids, sliced bread, and the polygraph.

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Invented in the late 19th century as a means to contain cattle in the American West, barbed wire soon found military applications. Bettmann / Corbis Bayonet: In the early 17th century, sportsmen in ...

The result is 300 groundbreaking inventions (and 100 special mention inventions )—including an AI detector for teachers, a ...