Feature

Mercury’s Core May Be Metallic

Back Matter

Memorable Debate: Do Old Brain Cells Die?

Cow’s Milk Not Linked to Early Diabetes

Books

Behavior

New Dye Adds Depth to Data Storage

Peanut Allergy Found Common and Increasing

Results from a Solar Cycle of Neutrino Data

Images Hint at Seeds of a Giant Galaxy

Of Tea and Heart Disease

Chemistry