You may have noticed that if you see someone yawn, you feel an urge to yawn yourself. This is called contagious yawning. But a new study shows that rates of contagious yawning are higher near relatives, followed by close friends. The study suggests that yawning may be a way to empathize with others by showing you are feeling the same way they are feeling.
Read more about this study on National Geographic News.
Make your family tree into a mobile on National Geographic Kids.
Photograph by Lynn Johnson, National Geographic



























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