Feature

Clean Water Bills Now Go to Conference Committee

States Lose Bid for Role in Radiation Standards

High-Power, Short-Pulse Laser: A Significant Step

Did the Seeds of Life Come from Space?

Model for DNA Evolution: Chicken-and-Egg Problem

Enzyme Activity Traced to Its Genetic Origin

Toward Better Treatment of Stomach Ulcers

Malpractice Commission: Findings Delayed

Front Matter

Books of the Week

Ethics of Lobotomies

Roots of Civilization