Feature

Front Matter

One-Third Empty May Be Normal

The Babel Effect

Milky Way’s Heart Gushes Antimatter

FDA Can Regulate Tobacco as a Device

Exercise Helps Some Cancer, Heart Patients

Gene May Further Obsessions, Compulsions

Chemical Weapons Treaty Sets Deadline

Tying Physical Theory into Stable Knots

Paleontologists Deplume Feathery Dinosaur

Hormone May Directly Trim Fat from Cells

Astronomy