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I Found a Penny Today, So Here's a Thought |
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"In the psychological development of the child, there is a step-by-step progression from the primal smile to the smile of embarrassment, joyful laughter, laughter at a comic situation, laughter in a group, aggressive laughter at an outsider, and finally (a somewhat depressing climax) the laugher of Schadenfreude. ... [A]t each step laughter signifies an experience of relief ( Entlastung), both physically and psychologically." — Peter Berger, Redeeming Laughter: The Comic Dimension of Human Experience (1997)
The evolution of the smile and laugh, from Frans de Waal's "Darwin's Legacy and the Study of Primate Visual Communication" ( PDF), via Cystalpunk.
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