Microwaves are a common part of our kitchens. They cook foods much faster than conventional ovens, and they also defrost frozen food in a few minutes. They are also used in medical applications to heat tissues, treat pain and to destroy cancer cells. They are even used by the military for radar and satellite communications.
A microwave oven generates electromagnetic waves in the same way that a radio or television receiver does, except that it is powered by an electromagnet. The electromagnet creates microwave radiation which passes through the food inside the oven and is reflected back and forth by atoms and molecules in the food. This process causes the food to absorb energy from the microwaves, and the energy is converted to heat.
The microwave oven uses a glass turntable that spins the food to distribute the heat evenly. This is important, because microwaves can bounce around in the oven and hit different parts of the food differently. This produces hot and cold spots in the food which is not good for our health.
The human central nervous system is very sensitive to microwave radiation, and many scientists have studied the effects of this on the brain. Some have found that microwave radiation can affect the morphology of the brain, as well as its function. It can also cause abnormalities in EEG (electroencephalogram) recordings. Other studies have found that microwave radiation can influence the behavior of animals and people, including changes in learning and memory abilities.