Feature

Front Matter

Cost of Coal Is Reduced by Safety Measures in Mines

New Scale Invented for Measuring Snow

Molecules Rebound Safely from White-Hot Surface

More Americans Killed by Autos than by World War

Gulf Stream Writes Own Temperature Record

Round Temple Is Rare Find in Aztec Ruins

What Babies Think About

First Glances at New Books

[Photograph]: Where Conversation Begins to Jump the Oceans

Protective Foods: “A Classic of Science”

Criminals Who Will Repeat Detected by Simple Test