TED-Ed Lesson: The word “normal” is often used as a synonym for "typical," "expected," or even "correct." By that logic, most people should fit the description of normal. But time and time again, so-called normal descriptions of our bodies, minds, and perceptions have turned out to match almost no one. So what does normal actually mean— and should we be relying on it so much? Yana Buhrer Tavanier investigates.