Feature

Two Weeks’ Delay Precedes X-Ray Sterility in Mice

Better Trees Being Bred for Future Forest Crops

New Washington Quarter Has Wrong Species of Eagle

Larger Families May Again Become Fashionable

X-Rays Can Speed up and Reverse Evolution

Energy Survey Being Made by Jobless Technical Men

Invisible Germs Should Not Stop Disease Fight

Science Explains Hang-over after Alcoholic Debauch

Front Matter

Twins Reared Apart Develop Mental Differences

New Chemical Used to Fight Fungous Diseases

Nature Ramblings: Lovers of Open Fields