Feature

Physics

The Splintered Universe

Gone Fishing! Scientists Use Mutant Zebra Fish to Learn How Vertebrate Embryos Develop

Animal Science

Tibet Reveals Its Squishy Underbelly

Books

Pollution Helps Weeds Take over Prairies

Clue to Lou Gehrig’s Disease Emerges

African Fossil Pushes Back Human Ancestry

Do Sea Turtles Stop and Ask for Directions?

Back Matter

Low-Dose X Rays Can Sharpen Fine Details