Flints Called Eoliths, 1,000,000 Years Old and Flaked so Crudely that Only the Expert Can Tell Whether Man or Nature Made Them, Have Been Discovered in Europe. What Do They Signify?
Pitfalls Menace and Pseudo Short-cuts Beckon the Feet of Those Who Seek Easy Methods of Reducing Their Weight
Coal Smoke Is Not a Necessary Evil; It Represents Wasted Fuel. New Processes Which Will Turn This Waste Into Valuable By-products Are Being Developed. What Is Their Real Significance?
An Experimental Arch Dam, Built to Determine the Exact Stresses with the Water at Various Levels
Are the Moon's Craters Volcanic or Are They Meteoric "Shell-holes"?
Cluster of Seven Lights Carries Inventor Toward the Goal of Wireless Vision
Latest Addition to the Growing Fleet of Cruisers Consists of Four Ships Showing Remarkable Novelty of Design
The Second Interview of This Series Is With a Man Who Has Capitalized the Human Desire for Play
A Department Devoted to the Advancements Made in Industrial and Experimental Chemistry
All Over the Bible Lands, from Dan to Beersheba, the Archeologist Is Busy Turning Over Ancient Mounds and Revealing City Sites
The Romantic Search for New Chemical Elements Is Not a Blind Hunt But Is Guided By Remarkably Beautiful Scientific Principles of Prediction. How the New Element "Illinium" Was Found. Other Elements Are Now Being Sought
A department devoted to the presentation of useful ideas wherein will department devoted to the presentation of useful ideas wherein will be found material of practical value for those who are mechanically inclined
Divers Fields of Endeavor Are Drawn Upon in an Effort to Check the Enormous Waste Caused by the Constantly Increasing Hordes of Injurious Insects