Feature

Materials Science

Bomb Testers Beware: Trace Gases Linger

Earth Science

Yeast Peptide Goes Forth and Multiplies

Unusual Fats Lose Heart-Friendly Image

Biology

Meteorite Hints at Early Life on Mars

Genome Sequenced for Skin Disease Virus

Front Matter

Counting Millions of Electrons, One by One

Books

Population Convergence?