Feature

Sex Hormone Treatments Replacing Youth Operation

Double Blessed Event More Likely for Older Fathers

Derivative of Castor Oil Now Used in Fly Spray

Front Matter

New Electron Microscope May Some Day “See” Atoms

Franklin Medals Awarded to Compton and Baekeland

Germ-Killers in Soil Promise Conquest of All Bacteria

National Academy of Sciences 1940

Science Most International of All Human Activities

Color-Change Chemistry Studied in Catfish

In Science Fields

Sunshine and Atoms May Be Power Sources of the Future