Melting Chocolate.

The microwave oven was born in 1946 by accident. Percy Spencer was in one of his Raytheon Company laboratories standing next to a magnetron, which is the operational part of radar equipment, with a chocolate bar in his pocket. The candy melted. Possessed of a scientist's inquisitiveness, Spencer sent for unpopped popcorn. When he put it next to the magnetron, the popcorn popped. After Spencer conducted careful experiments, Raytheon patented the "high frequency dielectric heating apparatus" in 1953.