Feature

Fluorine in Water Causes Spotted Teeth

Temperament and Health Possibly Correlated

[Photograph]: Attacking the Air with Pick and Shovel

Michelson’s Last Experiment to Be Finished by Associates

Promise of Genius in Children Revealed by Simple Tests

In Science Fields

The First of the Rare Earths: “A Classic of Science”

Gap in Einstein Theory Filled by New View of Physics

Reversed Blood Flow Relieves Gangrene

Weather of Upper Air Studied with Airplanes and Balloons

Astronomers to Study Meteors from Stations in Arizona

Pleasant Words Are More Easily Remembered