Feature

Microscopic Worms Are Champion Chiselers

Two Planets Visible

“Rules of Reasoning” Urged for Modern World

Smithsonian Research Adapted to War Effort

Salesmen Pinch-Hitting for Doctors as Advisers

Flood Forecasting

Front Matter

Polio Virus Isolated

Insects Replace Steak?

[Photograph]: For Future Fleets

Bald Bronchial Tubes Fatal

Try Immune Serum