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...sun's rays as feeling good on their skin. By nature, many of us even make an effort to stay on the sunny side of the street while walking about. Factually, the sun is 93 million miles away from Earth. Its energy travels to us in moving waves called radiation. That energy takes the form of heat, light and other energy as well. Visible sunlight allows us to see the world around us. But there is invisible sunlight, too. These rays can not be seen. Some can be felt as heat. But some can not be felt. They are called ultraviolet rays, and they are the culprits in changes that happen to the skin, like wrinkles and even cancer. When one wears a sunscreen, those are the rays from which they are protecting themselves. A protective blanket of gases known as the atmosphere surrounds our planet. It provides us with the air we breathe, and it protects us from the full blast of the sun's radiation. Way up in the part of the atmosphere called the stratosphere, a layer of gas called ozone filters out most of the sun's damaging ultraviolet rays. This happens about five miles to...