Feature

Snails and Tortoise Not Lazy but Muscles Slow

Lens Snaps Clearer Photos High in the Air

Trains Pulled by Diesels Believed Temporary

Books of the Week

Spectral Lines Measured

Over 400 Astronomers See Vatican Observatory

In Science Fields

Gum Disease Curable, Preventing Loss of Teeth

Belly Landing Makes Runways Obsolete

DDT More Dangerous, Fat Accumulation Hints

Complete White-Negro Mixing in 1,000 Years

Role of Engineers