Feature

Low-Dose X Rays Can Sharpen Fine Details

African Fossil Pushes Back Human Ancestry

Do Sea Turtles Stop and Ask for Directions?

Back Matter

The Search Goes On

Making Antihydrogen Atoms at Fermilab

Front Matter

Books

Clue to Lou Gehrig’s Disease Emerges

Science and Math Education: No Easy Answer

How the Brain Knows When Eating Must Stop

Biomedicine