Why do people yawn while seeing other people who yawn? —Mithra, age 7, Chennai Yawning happens when you open your mouth, take a deep breath and take in air without even thinking about it. You might be tired, bored or waking up. Most people yawn six to 23 times a day – even animals yawn! You may have noticed that you often yawn after you see someone else yawn. This is called “contagious yawning”. Contagious yawning feels automatic, like a reflex you don’t have to think about. But scientists know it’s not completely automatic because we are not born knowing…