Feature

Front Matter

Galileo: Seeing and Perceiving

Beneath California’s Hills, Another Earthquake Hazard

Long Valley: More Eruptions in Shorter Time

The Senile Brain: What’s the Matter?

Prey Caught with a Smell and Sinker

Dentists Hail Sealants for Curbing Cavities

Magellanic Clouds: Then There Were 3

Sunny Prospect for Dioxin Degradation?

Sodium Signal Reassessment

U. S. Space Probe Heads for a Comet

Shuttle Fire under Study