The doctors reveal how big your lungs would be if they were laid out flat and why you need to cough, and in Operation Takeover they find out what it's like to work in the hospital canteen. Dr Chris tries to solve a crime with the help of medical science and a forensics expert, and there are more medical mysteries solved as Ouch and About On Call hits the hospital wards. Meanwhile, in accident and emergency, one patient comes in after falling on her wrist, and another has a rubber stuck in his ear.