Your mind and body are connected in countless ways, and some are more mysterious than others. Discover how your mind and body sometimes work together like the best of friends-and how they sometimes betray each other like the worst of enemies.

Ever wonder why yawns are so contagious? Like it or not, much of your behavior is influence by copying others. Through a series of games and experiments, discover whether your brain is a born leader--or a born follower.