Feature

A Needed Levee Extension

Challenger: The 2nd Shuttle’s 1st Flight

Virus Now Indicted in Toxic Shock

AIDS Update: Search for ‘Agent X’

Cannibal Stars Eat Companions Whole

Hominids Bear up, Become Porpoiseful

New ICBMs Urged by Presidential Panel

Why the Eye Lens Is Transparent

Mr. Skeleton Goes to Washington

Accelerators Won’t Hasten Doomsday

Insulation Ban Toppled

Chemistry