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In the December 5 Issue:
- TABLE OF CONTENTS
- Climate might be right for a deal: Copenhagen negotiations will take steps toward a climate-stabilizing treaty
- Botanical Whales: Adventures in the Tortugas reveal that seagrass fields need saving too
- Breaking the Speed Limit: Studies examine physiology and technology to better foresee the ultimate edge of human performance
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On a clear day
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Urban air often hosts up to 10,000 particles per cubic centimeter. But, a team from Carnegie Mellon University found, on some apparently pristine days in Pittsburgh (above), the air may hold up to 150,000 particles per cubic centimeter.
Credit: Sdominick/istockphoto
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