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Explore 3 published pages tagged with Invention History, grouped automatically from article text, entity focus, and recurring topical signals.
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Culture & Subcultures
The Ouija board is a flat board marked with letters, numbers, and simple words, paired with a heart-shaped pointer called a planchette. Users place fingers on the planchette and...
Open articletechnology
The microwave oven was invented in 1945 when American engineer Percy Spencer, working on radar magnetron technology at Raytheon, noticed that a candy bar in his pocket had melte...
Open articleToys & Hobbies
In 1943, engineer Richard T. James was testing tension springs for shipboard instruments when a loose spring fell end-over-end across his desk. This simple motion revealed the c...
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