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Nerve Center Of The Yankee Clipper

How Safe is Air Travel?

Rapid Advance in Air-Transport Operations Has Been Made Possible by Applied Research That Aims To Take Every "if" Out of Air Travel

By R.E. Johnson

Animals Bring Us Diseases

Pets, Domesticated and Wild Animals Carry Bacilli Deadly for Humans . . . Are Hosts to Parasites Causing Serious Human Ailments, Death

By William Wolf

On the Site Of Armageddon

The German Navy at a Glance

Your Inferiority Complex

Few of Us Attain that Perfect Balance Between the Two Extremes of Actual Inferiority and Self-Importance that Constitutes Emotional Maturity

By Paul Popenoe

Staticless Radio

Invention Opens Up New Uses for the High Frequency Channels, Receiver Automatically Rejects Static Impulses

The Curious Case of Liquid Helium

Wherein a Liquid is Discovered to Behave like a Cat-footed Burglar and to Puzzle Scientists by its Extraordinary Fluidity, Still Is a Puzzle

By Thomas H. Osgood

Science Dissects the Pearl

Oldest Gem Gives Up Its Secrets, How and Why Make-Up Varies, Iridescence, Nucleus Usually Absent, Microscope, X Ray, Other Tools Used...

By A. E. Alexander

Inside the Stars

Why do the Stars Shine, How do re Know They Are So Exceedingly Hot inside, and What Makes them So ? From Whence Coles their Vast Store of Energy?...

By Henry Norris Russell

More Water for Niagara

A New Weir Raises Water Level in Power Plant, Increased Plant Capacity and at the Same Time Enhanced the Spectacle of the Falls

By R. G. Skerrett

Comfort Cooling

Significant New System, Proved by Hospital Tests, No Costly Equipment, Employs Body-Radiation Reflectors, Absorbers, Cools No Air

Flexible Power in the Woods

By Andrew R. Boone

Fourth Annual Scientific American Amateur Photography Contest


  • 50 Years Ago, May 1939

  • From the Editor

    Our Point Of View, May 1939

  • Recommended

    Books Selected By The Editors, May 1939

  • Departments

    Personalities in Science, May 1939

  • Stopping The Marine Borer, Trunk-Size Refrigerated Container, and more

  • Camera Angles, May 1939

  • Camera Angles Round Table, May 1939

  • Telescoptics, May 1939

  • Current Bulletin Briefs, May 1939

  • Legal High-Lights, May 1939

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