Feature

Sex Found in One-Celled Animal Considered Sexless

Mythical Gun That Aims Itself Seems Impossible to Silence

Accelerated Weathering Tests Building Materials

Nature Ramblings: “Slime of the Earth”

Modern Chemistry Finds Why Greeks Prized Famous Spring

Front Matter

Vitamin C Is Suggested as Treatment for Pyorrhea

Chinese Civilization Is Not so Ancient as Once Thought

[Photograph]: Largest Chrome-Alum Crystal?

Oldest Man Once Lived Where Fighting Now Rages

Cosmic Ray Radio Balloon Followed by Plane to Ground

First Two Weeks Are Hardest; Chicago Wants to Know Why