How the Ozone Layer Works
If you've ever gotten a nasty sunburn, you've experienced the singeing effects of ultraviolet radiation from the sun. In fact, you probably made a personal vow to forever apply (and reapply) sunscreen on sunny days. Luckily, the earth shades us from the vast majority of intense ultraviolet light with its own sunscreen -- the ozone layer. Without the ozone layer, we wouldn't just sunburn, there's… » Full Story on HowStuffWorks
