JOHN COLE / SCIENCE PHOTO LIBRARY JOHN COLE / SCIENCE PHOTO LIBRARY
Sunscreen application. Woman rubbing sunscreen onto a man's back. When sunbathing, sunscreens should be applied to protect the skin from the dangerous effects of ultraviolet radiation present in the sunlight. The ultraviolet radiation may destroy cells in the outer layers of the skin and repeated overexposure to the sun causes premature ageing and may also increase the risk of skin cancer. Most sunscreens protect the skin by absorbing the ultraviolet radiation. The typical compound used is para-aminobenzoic acid (PABA). Other sunscreens use compounds such as titanium dioxide and work by reflecting the Sun's rays.
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