Feature

Dust Storms “Make Air Blue” by Light-Scattering Effect

Not “Going to Prairie-Dogs” Drought Cycles an Old Story

Heavy Water Molecules Trace Water in Body

Drought Still Holds Empire in West, from Coast to Plains

Drought Menaces Irrigation Areas East of Rockies

Cosmic Rays Not Likely to Be Future Power Source

All-Metal Airplanes Not in Danger from Lightning

Carbon Dioxide May Help High Altitude Flyers

Body Tissues Not Germ-Free; Bacteria in Dissociated State

Gaseous Nebulae May Be Ghosts of Exploded Stars

In Science Fields

When Sharks Ruled the World