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Learn what causes dizziness in this new video from Scientific American's Instant Egghead series. In this short movie, I explain how your inner ears work to help you balance, orient yourself and see what's around you in a stable fashion. When your inner ears don't function well, you may stumble, fall, vomit and watch your surroundings gyrate wildly. See this feature in Scientific American Mind on the making of an implanted prosthesis to restore balance and correct dizziness in individuals with inner ear problems.