Feature

ERTS: An Earthwatch from Orbit

Antarctica’s Ice Cap: Older than Believed

Physical Sciences

Government Scientists Venture a Quake Prediction

Books of the Week

U.S. and Soviets Plan 25 Research Projects

Environment

Preparing for Missions to Mars and Venus

Behavioral Sciences

A Call for a Change of Attitudes toward Drugs

A Surprising Ban for St. George’s Seals

Abortion as Contraception