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Absentee: Kyuhyun Tongue & Taste Buds - Tea tasting: Yong Dam (bitter herbal tea) - Drying and cool to numb the tongue - Taste sensation - Chilli pepper tasting: Korean Chunhyang Pepper, Thai Prik ki nu Pepper, Mexican Habanero Pepper, and Indian Bhut Jolokia Pepper Eyes & Change Blindness - Spot the difference: flashing pictures on a screen - Tricking the eyes: doctor switching (group prank)

Absentee: Kyuhyun Co-MC: Shindong Digestive system and the food that enters it - Swallowing food whilst upside down - Eating dessert when stomach feels full - Drinking beer and water

Absentees: Kyuhyun and Heechul Co-MC: Eunhyuk - Arm wrestling - Electronic muscle stimulation

Absentees: Kyuhyun, Heechul (first and last parts of the show) and Han Geng (last part of the show) Co-MC: Eunhyuk - Weightlifting, the use of liquid Ammonia and Magnesium Carbonate - Long jumping; holding the golf balls and using tape on toe finger - Lifting person with your fingers

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

Absentees: Kyuhyun, Kangin, Yesung and Heechul (first half of the show) Co-MC: Shindong - Sense of equilibrium - Sense of balance - Spinning machine - Restoring the sense of balance after spinning by chewing on dried squid, holding balls of aluminium foil and spotting

Co-MC: Heechul - Improving flexibility in doing the splits: rubber banding the first two toes together, juggle (soccer) a jaegee (like a hacky sack) 10 times with your feet, and hitting the inner thighs in the horse-riding position. - Enhancing flexibility and strength in your back: the grasshopper position (as seen in the Korean film, Oldboy). - Improving flexibility in touching your toes: the "Octopus Dance," and massaging the ribs. - Super Junior members try to contort into a 58 cm x 53 cm x 53 cm box after a demonstration by two Chinese contortionists.

Co-MC: Ryeowook - Slow-motion camera - Acting out emotional scenes - Two team stimulation with peppers/onions & fans - Comparing saltiness of tears from stimulation & emotion - Ryeowook & Eunhyuk Secret Camera

Guests: DBSK - Determining your reflex age with ruler dropping. - Comparing reflex speeds of DBSK and Super Junior members by baseball sliding. - The top 3 members from each group compete in a 1-on-1 dodgeball tournament.

Guests: DBSK - DBSK members taste the hottest peppers in the world (as seen in the first episode). - DBSK and Super Junior members compete in a vertical leap test. - DBSK and Super Junior members compete in how quickly the members are able to touch a falling ball (from 7m high) after running from a far distance (7-10m)

Absentees: Han Geng and Siwon (second half of the show) - Two team separation (One to shoot moving target and Two to catch/deflect an arrow) - Team One: Heechul, Kangin, Shindong, Kibum, Kyuhyun, Siwon - Team Two: Leeteuk, Yesung, Sungmin, Eunhyuk, Donghae, Ryeowook

Absentees: Siwon - Two team separation (One to use props to breathe underwater and Two to exchange air underwater) - Team One: Leeteuk, Heechul, Shindong, Donghae, Kibum, Kyuhyun - Team Two: Han Geng, Yesung, Kangin, Sungmin, Eunhyuk, Ryeowook - Team One contend against a Synchronized swimmer. - Team One Method: A material object to seal in air. - Team Two: Mouth-to-mouth.

Absentees: Han Geng (first half of episode) and Siwon (second half of episode) - Testing the Police Dogs wearing special clothing - Testing dog's sense of smell & comparing it to a human's - Getting acquainted with the dogs/discussing how to fool sense of smell - 30 minutes to find "fugitives" by smell - Team One (Police): Leeteuk, Heechul, Donghae, Kibum, Kyuhyun, Siwon, Sungmin - Team Two (Fugitives): Yesung, Kangin, Eunhyuk, Ryeowook, Shindong, Han Geng