Humor. No one knows exactly why we laugh or why anything that is funny should cause us to make such a peculiar noise. It would be just as logical to stick our thumbs in our ears and wiggle our fingers as it is to giggle or bellow or howl with laughter. But when something strikes our "funny bone," our diaphragm flutters up and down, and we laugh.
The urge to laugh appears very early. Babies smile, then coo, and finally chuckle when pleased. If certain parts of the baby's body are tickled with the fingers, laughter occurs. But by the time children attend school, they also laugh at things they hear and see.
Stories are among the most popular forms of humor. As a rule, a story is considered inferior if it embarrasses someone, if it makes something sacred appear common, if it makes a person's weakness the cause for laughter, if it has to have vulgarity to be funny, or if everyone cannot join in the enjoyment of the joke.
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Source: Cohen, Sarah Blacher. "Humor." World Book Student, World Book, 2017, www.worldbookonline.com/student/article?id=ar266980. Accessed 11 Sept. 2017.