Feature

Making the Deuterium Fit the Big-Bang Theory

Did Lunar Volcanism End 3 Billion Years Ago?

The Chances of Contacting Extraterrestrial Civilizations Seem Poor

Environment Message: A Middle Path

NAS Calls ’75 Standards Technologically Feasible

Oily Seas and Plastic Waters of the Atlantic

Soviets and Americans Tackle Heart Disease

Earth Sciences

Medical Sciences

Behavioral Sciences

Why Stars Twinkle

Test-Tube Babies in the Makings