Feature

Armadillo Study Shows Identical Twins Differ

U.S. Now Has Capability for Twin Space Shot

Patents of the Week

New Ideas and Gadgets

Treat Sewage by Bacteria Jolted with Electricity

[Photograph]: Dry Ball Bearing

Back Matter

Radio Messages Ride on Meteor Trail

Survey of Course Trends

Doctors Are Reading

Fly Detects Poison Gas

Flying Ships for Combat