Feature

New Machines and Gadgets

Front Matter

Vitamin May Be One Key to Diet-Cancer Problem

[Photograph]: How It Looks Inside

New Vitamin Hunger Disease Is Found; Cured by Biotin

“Phase Modulation” Radio Cannot Be Jammed by Enemy

Washington the Engineer

Meningitis Epidemic Warning Issued in AMA-NRC Report

Worry during War Normal but Shouldn’t Harm Work

In Science Fields

“Terrible Crocodile” One of Largest That Ever Lived

Limiting Vitamin A Will Cause No Hardship