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Note: In 1998, epidemiologist Merianne Berwick of Memorial Sloan-Kettering Cancer Center in New York evaluated of several studies on sunscreen use. Her conclusion: There is absolutely no evidence that use of sunscreen prevents skin cancer. In fact, five of studies found that sunscreen users actually had an increased risk of melanoma.
A recent study suggests that 15 minutes of exposure to sunlight each day will cause your skin to produce all vitamin D your body needs to remain healthy. Here in Arizona, 15 minutes of exposure to sunlight can kill you.
If you must go out in sun, wear protective clothing regardless of how hot you feel. Even if you are sweating like Niagara Falls, always wear long sleeves and a hat. Don't forget to cover areas like your neck and hands. Don't walk over bright surfaces like concrete for long periods of time. Your face can be exposed to ultraviolet radiation reflected from ground.
If you like to go outdoors, go out in morning or evening when sun is 45 degrees or less above horizon. At this angle, sunlight is filtered through a thick layer of atmosphere. You know it's safe to be outdoors when objects shadows are longer than objects are tall.
Before appearance of ozone layer, surface of earth was bathed in ultraviolet radiation making it impossible for life to exist. Unfortunately, modern industrial society has created ozone destroying CFC molecules, putting life on earth back in danger.
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