Feature

Fewer Natural Filters to Stem Tides

Dental Sealant Safety Reconsidered

Books

The Dark Side of Immunizations?

Calming Bad Vibes

What Gain from Eating Grain?

Keeping a Sharp Eye on Io

Material May Help Batteries Hold a Recharge

Astronomy

Front Matter

Compromise Reached on Census Sampling

Namibian Fossils Reveal Ancient Oddities