Volume 169, Issue 1
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Features
Sky Sentries on Guard
Imporant U. S. Centers Are Protected by Barrage Balloons
War Prisoners
Study and Teach Science Behind Barbed-Wire
Sugar, A 'Chemically-Pure' Food
Highly Technical Industrial Processes, Plus Efficient Operation of Plants, Produce Beet Sugar at Low Cost
Die Production, Odor Problems, and more
By New Method Reduces Time and Labor Requirements
Ultra-Violet--Near, Middle, Far
Many Industrial and Personal Uses Are Being Made of the Phenomena Surrounding these Radiations
Electronics Mystery, Molecular Attraction
Solved, May Lead to Improved Vacuum Tubes
Anthropocentrism's Demise
New Discoveries Lead to the Probability that There Are Thousands of Inhabited Planets in our Galaxy
Can Colds Be Prevented?
There is no Effective Method for the Prevention of the Common Cold--Not Vaccines, Not Vitamins
Climacteric, Heart Watching, and more
Do Men Also Have Such a Period?
'Wers' Calling
Radio Amateurs and Other Volunteer Workers are Setting Up a Communications System for War or Peace
Electric Brain, Radio Sewing Machine, and more
Remembers What Happens in a Rectifying Circuit
Three-Liquid Pump, Commutator Cleaner, and more
Helicopter Progress
Present Orders and Future Possibilities Point Toward a Fertile Field for Rotating Wing Aircraft
Fuselage Sandblasting, Flight Training, and more
Used in Fabrication of Primary Training Plane