Feature

Ancient People Made No Progress for 2,000 Years

Grinding Teeth Seen Harmful

Menace of Mental Retardation

In Science Fields

Books of the Week

History-Making “Churk”

“Bumpers” for Space Ships

Bacterial Mutant Helps Faulty Transport Study

Eye Level “Poles” Provide Flight Data

Measure Blood Pressure with New Instruments

Front Matter

Nature Ramblings: Southward Ho!