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After 70 years, we’ve finally figured out how to build a better microwave

After 70 years, we’ve finally figured out how to build a better microwave

You’ve probably never heard of Percy Spencer, but you’ve certainly used one of his most famous inventions—probably to make popcorn. The microwave was invented in 1947 and soon became an American household staple. The devices sped up the heating and reheating process in the kitchen, and flew off store shelves and onto countertops by the…