Identical twins Dr Chris and Dr Xand van Tulleken experiment and explore their way through the fascinating world of medicine and biology.
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The doctors experiment on their muscles to show how they work.
Dr Chris gets his hands on a real human brain.
Dr Chris lets a bloodsucking leech feed on his arm.
Dr Xand investigates how our shoes can dramatically change the way we walk.
Dr Chris uses Dr Xand to prove that the nose, mouth and stomach are all connected.
Dr Chris explains travel sickness, and Xand finally finds out if he really does snore.
Dr Chris takes a terrifying ride on a rollercoaster.
Dr Chris comes face to face with 180 of the world's most dangerous snakes.
Dr Chris goes on call with an emergency ambulance team.
Dr Xand meets someone who has developed the technology to grow bones in a laboratory.
Dr Xand donates his blood to see how it is processed to help save lives.
The doctors find out how your skin heals itself after an injury.
Dr Chris visits an allergy clinic to find out all about allergic reactions.