Feature

Saturn-Jupiter Triple Pass to Begin on August 15

Navy’s Chronometer Shortage Not Serious; Radio Helps

Front Matter

Half of Railroad Trackage Still Lacks Block Signals

Rocket Journey to Moon Shown at Fels Planetarium

Japan to Suffer Most from Ban on Aviation Gas Exports

Star Study Program Will Not Be Finished Until 2019

Shy, Unfriendly Dogs Are Just Born That Way

Indians of Both Americas Targets of “Fifth Columns”

U.S.A. Being Fingerprinted

Leadless Storage Battery Sought by Nazi Germany

[Photograph]: Family Group of 50,000,000 Years Ago