Explorers of the Human Body

Laughter (1x5)

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Absentees: Kyuhyun and Heechul Co-MC: Siwon - Laughing gas / Nitrous Oxide - Why is laughter contagious? - Laughter as exercise - How to prevent the urge to laugh: natural salt, pulling the neck skin/fat, biting cheek fat, pressing the pressure points in the body