Explorers of the Human Body

Laughter (1x5)

Air date: Dec 09, 2007

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