Feature

Front Matter

Earth’s Core Reported Not to Be Pure Iron

New Device Saves Cotton, Cuts Carding Costs

[Photograph]: Giant Furnace

All-Season Hibernation

Three-Fourths of Fallout Caused by Soviet Tests

Nature Ramblings: The Bald Eagle Club

[Photograph]: Electrode for Heart Cell

New Scientific “Sniffer” Detects Fuel Tank Leaks

Fatherless Potatoes Seen as New Aid to Breeders

Books of the Week

Study Slime Molds