Los Angeles Times
The effectiveness standard most of us associate with sunscreens the SPF, or sun protection factor measures only how well they block UVB rays. That's because scientists used to believe UVB rays acted alone in causing skin cancer ...So to measure how...
Los Angeles Times
The culprit is ultraviolet, or UV, radiation, which can actually be very useful in fluorescent lighting and sterilizing medical equipment, or by stimulating our bodies to make vitamin D. But a little goes a long way, and overexposure to UV radiation...