Feature

Livestock Diseases Now near Dangerous Peak

Front Matter

Aid Chemical Assay

Food for Teen-Agers

Cancer of Esophagus Cured with Skin Graft

Nuclei and Pi Mesons New Atom Types

New Machines and Gadgets

Billion Pounds of Soot

Safer Airport Promised

[Photograph]: High-Speed Aerial Camera

U. S.-Made Planetarium Is Featured at Swiss Fair

In Science Fields