Feature

Polio Vaccine Can Cause Penicillin Reaction

Two U.S. Atomic Subs Sail under North Pole

Sugar Preserves Dairy Cream

“Social Pressures” at Zoo Affect Animals’ Lives

Antarctic Fish Parasites Sent North for Study

New Machines and Gadgets

[Photograph]: Surveillance Drone

Body’s Emergency Fuel

Rubber Holds Properties at Temperature Extremes

Half of Population Will Die of Heart Disease

Cholera Claims 20,687

Control of Heredity Seen