Feature

Science News of the Year

Let’s Repeat: Mutation Gums up Brain Cells

Front Matter

Plastic and Health

Even Fraternal Twins May Share Cancer Risk

Small Comet Theory Faces Barrage from Foes

The Deep Blue Sleep

Teens Show Sex-Linked Pull to Cigarettes

Earth Science

Cultural Mix and Self-Enhancement

Fine-Tuned Plant Response to Insect Attack

Volume Information