Feature

Deep-Diving Sonar Built to Scan Ocean’s Floor

The Sluggish Sloth Also Wears Green Growth

In Science Fields

Equation for Insulation Saves Space and Money

Giant Valve Ends Rocket Vibrations

Explosive Fuel Additive for Rockets Contained

Women Warned on Drugs

Winners Enter Science

Delta Launches Syncom 3

Front Matter

Arctic Cold 14,000 Years

[Photograph]: Streamlined Hull