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In the February 25 Issue:

TABLE OF CONTENTS
Consciousness Emerges: Somewhere along a tangled path, sights, sounds and insights pop into awareness
Making Waves: Japanese quake gave scientists an unprecedented look at a big tsunami
Lessons from the Torpid: Hibernators have some helpful tips for keeping humans healthy

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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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