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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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OLDEST BIOMARKER

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Scientists detected a chemical fingerprint of animal life that appears to begin before the end of a major ice age, the Marinoan. The signal (shown orange) tapers after about 540 million years ago, perhaps because of the rise of other animals. Credit: Nature

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