Feature

Scientists Obtain Sample of Air 13 Miles above Earth

Stomach Ulcer Is Symptom of General Abnormal Condition

Billion Degree Heat Needed to Explain Stars’ Radiation

Nature Ramblings: Chitin

First Glances at New Books

Front Matter

“Fender Fracture” Is New Auto-Caused Surgery Problem

Sealed Contract 3,900 Years Old to Be Opened at Yale

Cloud of Island Universes Added to Known Space

Famous Great Caverns May Be Younger than Supposed

Another Sinus Causes Trouble, Surgeons Told

Moon’s Tidal Force Provides Trigger Starting Earthquake