Feature

“Yawn” and a Big Stretch Improves Rayon Fabrics

Fitness Test for Aviators Used on Mental Patients

Nature Ramblings: A Million Acres of Peace

Find South American Potato Suitable for Arctic

New Kind of Rupture Found under Immense Pressure

First Glances at New Books

Front Matter

Expanding Universe Theory Receives Blow in Discussions

[Photograph]: Better Tin Plate

Scientists Risk Lives in Carbon Monoxide Research

Gravity Value Determined at Bureau of Standards

New 1,200,000-Volt X-Ray Machine Aids Cancer Fight