Feature

Proton Puzzle Puts Physicists in a Whirl

Books

Methane Key to Arctic Mystery Mounds

Front Matter

Nicotine Boosts a Busy Body’s Metabolism

Earth Sciences

Looking for Mr. Greenhouse

Breast Cancer Risk Linked to Dense Tissue

Carbon Ratio Shows Halley May Be Alien

What Killed the Chickens?

Supercurrent Decay in High Magnetic Fields

First Things First