Feature

Shad Seem to Know Their Way Home, Study Reveals

New Machines and Gadgets

Nature Ramblings: Survival in Winter

Front Matter

Polio Clues from Pigs

Vegetables Kept Fresh

Streptomycin Checks Plant-Cell Growths

“Planned-for” Child Is Not Always Happy

More Effective “Shots”

[Photograph]: All-Weather Fighter Plane

Pups Get “Mental” Tests

One Kind of TB Is Helped to Grow by Streptomycin