Feature

Soviet Halley Probes Carry U.S. Gear

White House Unveils Gene-Splice Policy

Speedy Comet AMPTE

Behavior

Farmland Fading Fast

Planning by Computer: The inside Answer

Cholesterol Confab: Advise and Dissent

Hamburger Beefs up Cancer Protection

Earth Sciences

Whales and Dolphins Use Magnetic ‘Roads’

Science & Society

Front Matter