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 reveal what lurks inside the plaque on your teeth.
The doctors meet Larry the vomiting robot to show the power of puke.
The doctors take a close-up look at how the eye works.
Dr Chris uses a tiny camera to reveal what happens in his throat when he swallows food.
Dr Xand meets a pioneering professor who makes body parts.
Dr Chris extracts snot from members of the public for a very useful experiment.
The doctors prove that we all have invisible ink inside our bodies.
Dr Chris proves that the younger you are, the more sounds you can hear.
A patient has an infection on his cheek and another has something stuck in his ear.
The doctors look at some of the show's best bits so far.