Feature

Radioactive Materials Minor Hazard in Fires

Tin as Semiconductor

Quebec Crater May Be Mark of Ancient Meteorite

Uranium Is Superconductor at Very Low Temperatures

Polio Quarantine Useless

Stone Javelin Heads, Much like Yuma Points, Found

[Photograph]: “Lumpy”

How Slow Can a Plane Be?

Books of the Week

New Machines and Gadgets

Front Matter

From Now on: The Atom