Feature

Materials Science

Sooty Air Cuts China’s Crop Yields

The Killing Fields

Gene May Alter Ritalin’s Effects in ADHD

Vibrations Flit along Water’s Fast Lane

The Best Leonid Show Is Yet to Come?

Front Matter

Monarch Butterflies Use Magnetic Compasses

Earth Science

Computers

Editor’s Letter

Algae Need Not Be the Fittest to Survive