Is the world spinning, and you don't know why? Scientific American MIND editor Ingrid Wickelgren explains how your inner ear can throw you off balance. -- WATCH more Instant Egghead: http://goo.gl/CkXwKj SUBSCRIBE to our channel: http://goo.gl/fmoXZ VISIT ScientificAmerican.com for the latest science news: http://goo.gl/lHq0CH -- Written & presented by Ingrid Wickelgren Production assistants: Kathryn Free & William Herkewitz Produced & edited by Eric R. Olson

---