The microwave oven was discovered by accident!

The microwave oven is a necessity for every college student in order to survive. It's easy to use, and cooks food for you in a matter of minutes. Little do people know, that this nifty contraption was discovered completely by accident in 1945 during the second World War.

The British high powered radios had been dispersed through the front lines of the troops. This new technology provided a stronger radio signal - allowing messages to be spread faster. One of the engineers that worked at the copy that producer the radios, Raytheon, was a man named Percy Spencer.

While tinkering with one of the radios, Percy noticed that a Mr. Goodbar he had in his pocket began to melt. Percy hypothesized it was the radio waves that melted his candy bar. The first food that was deliberately cooked with this technology was popcorn, then an egg, which exploded in the face of the experimenters.

(Source)