Radiation is a form of energy which comes from man-made sources such as x-ray machines, from the sun and outer space, and from some radioactive materials such as uranium in soil. One of the most familiar forms of radiation is sunshine. It delivers light, heat, and sun tans. Its effect to an individual is controlled with the use of sunglasses, shade, air conditioners, hats, clothes and sunscreen. There would be no life on earth without sunshine, however, too much of it in one's body is not a good thing. If exposure is not controlled, it may be dangerous.