Volume 143, Issue 1
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Features
Looking Ahead With the Editor, July 1930
Exploring the Meydum Pyramid Site
Researches in Fog
Flying Clubs for Private Fliers
Results of the Naval Conference
Beautiful Roadsides
Move for Sightly Highways Is Becoming Countrywide
Planet X
Light Counts Cars on Bridge
Water Runs from Marathon to Athens
The Pilot 'Phones His Airport Via Radio
A World in Miniature
The Physical Nature of Death
Shipping Newsprint Paper in Safety
The Mystery of Gypsum Cave
Discoveries Near Boulder Dam Point Either to High Antiquity for Man in America, or to a Later Survival of Certain Extinct Animals Than Heretofore Has Been Believed
A "Flying" Outboard Motor Boat
Waves and Particles
The New Concept of the Nature of Matter
An Immigrant Plant Proving Ground
A Clearing House for Inventions
America's Cradle of Natural Science
A Curious Industry Owned by a University to Supply the Needs of Colleges
Chicago Gets a New Jail
America's First International Highway
Pre-Incan Aborigines Engineered a "Modern" Highway 4000 Miles Through the South American Andes
The Difference Between Tweedle-Dum and Tweedle-Dee
The Majority of the Discoveries of Practical Value to the World Have Been the Result of the Scientist's Penchant for Prying Into "Little Things" of Apparent Unimportance
The Amateur Astronomer, July 1930
A Monthly Department