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Neat News 2020-41 (added 2020-02-10)
Laughter as an offer of friendship
Public Domain by Hans von Aachen
| In a study across 24 societies it has been established that a main purpose of laughter is an offer of friendship. Laughter is typically learned by humans at an age of three months long before they can speak. |
News seen at: Scientific American - Behavior & Society
See also @news_neat.