Earth's Ozone Layer: Good News and a Puzzle

Think of the ozone layer as Earth's sunglasses, protecting life on the surface from the harmful glare of the sun's strongest ultraviolet rays, which can cause skin cancer and other maladies.

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<p><a href="http://www.physorg.com/news67869676.html">Earth's Ozone Layer: Good News and a Puzzle</a></p> <p>Think of the ozone layer as Earth's sunglasses, protecting life on the surface from the harmful glare of the sun's strongest ultraviolet rays, which can cause skin cancer and other maladies.</p>