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While Dr. Percy Spencer was conducting other research, he discovered that the chocolate bar in his pocket melted due to him being exposed to microwaves of energy.
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This beauty weighed about 750 pounds and cost $5000 ($53,000 in today's dollars).
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This model was smaller, safer and cost only about $500.
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By 1975, microwaves outsold conventional gas ovens and had many more features.
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By 1997, 90% of U.S. households have a microwave oven.