Feature

Front Matter

Seven Times Rebuilt Pyramid Explored at Tenayuca, Mexico

Atmosphere Said to Be Very Hot Fifty Miles above Earth

Magnetism Reveals Differences in Steel

Pictures of Spinning Model Demonstrate Atom Structure

New Science Ship Will Work across Ocean

Ice Hung in Baskets Melts More Slowly

Elusive Aurora Is Duplicated in Evacuated Glass Tube

Size of Newest Planet Is Still Undetermined

Telescope with New Features Will Take Best Star Pictures

Automatic Seismograph Works Only When Quake Starts It

Chemist Describes Poison Ivy and Tells What to Do about It