[Here](https://www.youtube.com/watch?v=Ov-kXSS1_yc) is a great video to introduce the topic and there are sources included in the video description to study more in depth.
Gelotology is the specific name of “the study of laughter”. There are many different theories on humor and why people find things “funny”. As far as why laughter developed in animals like humans? It is a social cue. A pre-language system of communication.
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