Researchers agree that optimum napping time is between fifteen minutes and two hours. During a nap that’s shorter than fifteen minutes, you never enter the most restful phase of sleep. But if you sleep for over two hours, you might not be able to fall asleep when you turn in for the night.
The secret is in the unique way microwaves work. Conventional ovens heat up the air inside the oven first then heat up the surface of the food and then heat up the inside. Microwave ovens cook the inside of the food right away, without heating up the surrounding air. They do this by using high frequency electromagnetic waves.
The thing is that hair is a lot tougher than skin. So the same chemicals that destroy the hair can also cause serious skin irritation–and possibly even chemical burns–if left on too long.