Feature

Experiments with Big Guns Give New Sound Speed Value

Czar’s Books, Rare Costumes Come to Philadelphia Museum

Front Matter

Is One-Rail Train Next Step for Land Transportation?

In Science Fields

Bureau of Standards Urges Use of Informing Labels

Artificial Radioactivity Produced for First Time

Air Raid Menace Debunked by Soldiers and Scientists

Zinc-Acid Reaction Yields Heavy Hydrogen

Nature Ramblings: A Lesson from Arachne

Study of Pituitary May Yield Thyroid Disease Treatment

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