Feature

U.S. Explorers Seek Mayan Cities in Yucatan

Some Problems Still Stymie the Computers

In Science Fields

Venus Shines in West

Front Matter

Heart X-Rays Advised

X-Ray Risk Kept Small

New Surgeon General Seeks High Quality Staff

Synthetic Skin Aids Burns

Birth Defects Studied

Membrane Role in Cell Metabolism Discussed

President’s Gallbladder Operation Successful