Feature

Explaining Water: Focus on Broken Hydrogen Bonds

Environment

NAS Suggests Extension of Emission Deadline

The Decision on the Shuttle Is ‘Go’

Vitamin E: Who Needs It?

A Legal Challenge to AEC’s Dual Roles

A Scientific Look at Vietnam Veterans

Front Matter

Tunnel Technology and the Hot-Hole Digger

Books of the Week

Oceans as Alphabet Soup: Focus on DDT and PCB’s

Films of the Week