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hello! How are you?

When I was reading my text book, I could not get the idea of 'funny bones'. Help me please.

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We laugh for lots of different reasons. laughter is part of every human culture. Like language, it's a basic part of being human. Unlike language, however, laughter does not have to be learned. Babies firs laugh when they are as young as three to four months old.

It will be fun to find out what tickles our funny bones and why laughter may really be the best medicine.

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My question is

--- Do people have any bones affects or effects laughter?

or

-- Is that any kind of idiomatic expression?

Thank you always!!
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We don't have bones that make us laugh. It's just an expresion to indicate something that we find funny.
Oddly enough, we do have a nerve in the elbow that we refer to as a "funny bone", but it doesn't make us laugh. When we hit it the wrong way it is somewhat painful.
Comments  
This is an idiomatic expression. See, in Latin the name for a bone in your elbow is called the humerus. The English word "humorous" (which means funny) sounds very similar to the name of that bone. So English speakers have done a play on words there and named the humerus the funny bone. Don't take it literally. Emotion: smile
Students: We have free audio pronunciation exercises.
 Philip's reply was promoted to an answer.
thank you! like always
thank you so much
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