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Social laughter is correlated with an elevated pain threshold.

Proc. Biol. Sci. 2012 Mar 22;279(1731):1161-7.
PubMed Citation Journal Link

Although laughter forms an important part of human non-verbal communication, it has received rather less attention than it deserves in both the experimental and the observational literatures...is due to laughter itself and not simply due to a change in positive affect. We suggest that laughter, through an endorphin-mediated opiate effect, may play a crucial role in social bonding.

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Paleo Diet for Pain
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10 Healthier Ways to Spend Black Friday

Mark's Daily Apple
November 22, 2012
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