Microwave energy is a natural phenomenon that occurs when electric current flows through a conductor.
Microwaves are a form of electromagnetic radiation that is very similar to sunlight and radio waves.
Like many of today's great inventions, the microwave oven was a by-product of another technology. This intrigued Dr. Spencer, so he tried another experiment. This time he placed some popcorn kernels near the tube and, perhaps standing a little farther away, he watched with an inventive sparkle in his eye as the popcorn sputtered, cracked and popped all over his lab. The next morning, Scientist Spencer decided to put the magnetron tube near an egg. Spencer was joined by a curious colleague, and they both watched as the egg began to tremor and quake.