Feature

Indium Used on Planes

[Photograph]: Giant “Spark Plug”

Typhus Vaccine Reliable

Vegetables Prevented from Loss of Color

Sound Travels Slower as Temperature Drops

Two-Boat Transportation for Bulldozers Patented

Test Your Science Talent

X-Ray Tube Locates Foreign Bodies in Tires

Hand-Pushed Weeder Invented for Gardens

Cloaks of Invisibility

New Machines and Gadgets

Front Matter