Feature

Americans Join British in London Conference

New Machines and Gadgets

Dropping Two or Three Miles Makes Jumper Think Better

Chickens Are Incriminated as Source of Encephalitis

Light Colors Painted on Machinery Improve Seeing

Cosmic Rays Created by Self-Annihilation of Atoms

Sulfa Drugs May Substitute for Quinine for Malaria

Air — Breath of Life

Front Matter

Students Taught to Control Skin’s Electric Resistance

From Electron to Universe by New Multiplication Table

Hurricane Season Follows Two Years without Storm