Physiology

Your DNA is not a blueprint. Day by day, week by week, your genes are in a conversation with your surroundings. Your neighbors, your family, your feelings of loneliness: They don't just get under your skin, they get into the control rooms of your cells. Inside the new social science of genetics.

• By David Dobbs

Norwegian researchers find a strong and immediate genetic response to yoga practice.

• By Tom Jacobs