Why do humans laugh?

Why do humans laugh? Bingo Card
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This bingo card has 16 words: Free!, ‘Mask other emotions’, Spontaneous, Persuasion, Psychological, Overwhelms, Coordinated, Contagious, Physiological, Phenomena, Endorphins, Trigger, Multifaceted, Intricately, Behavioural Signal and Free!.

⚠ This card has duplicate items: Free! (2)

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With players vying for a you'll have to call about __ items before someone wins. There's a __% chance that a lucky player would win after calling __ items.

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