Feature

Explosion Sound Bears News of Stratosphere

Scratch-Proof Mirrors Made for Telescopes

[Photograph]: A Highway Model

First Glances at New Books

Front Matter

Twelve Swamp Dinosaurs Found by Museum Party

How Dinosaurs Died 125,000,000 Years Ago

Old Violin Makers’ Secrets Revealed by X-Ray Analysis

Don’t Buy “Gas Savers” Warns Bureau of Standards

Cancer Caused by Virus Present in Even Normal Cells

[Photograph]: To Catch the Starlight

Chemists Now Puzzled by Two Kinds of Element No. 93