28min - The doctors reveal what lurks inside the plaque on your teeth, Dr Chris uses a remote-controlled car powered by his own wee, and Dr Xand decides to get his verruca treated.
28min - The doctors meet Larry the vomiting robot, and Dr Xand goes on an urgent mission to deliver blood to a hospital.
28min - The doctors take a close-up look at how the eye works, and Dr Chris finds out what body fat does by looking at some of his own under a microscope.
28min - Dr Chris uses a tiny camera to reveal what happens in his throat when he swallows food, and Dr Xand enters a special chamber that removes sensory data from his brain.
24min - The doctors take a closer look inside their ears to prove how earwax has a really important job to do, and Dr Xand meets a pioneering professor who makes body parts.
28min - The doctors look at the awesome work that goes on inside the liver, and Dr Chris extracts snot from members of the public for a very useful experiment.
28min - The doctors prove that we all have invisible ink inside our bodies, and Dr Xand sees head lice removed from someone's hair with a vacuum cleaner.
28min - The doctors use real stomach acid to do an experiment to reveal how the digestion process starts.
27min - The doctors show that your breath is just as unique as your fingerprints and Dr Chris goes behind the scenes of medical drama Casualty.
27min - Dr Chris and Dr Xand demonstrate an awesome body trick and reveal another way the human body heals itself after an injury.
28min - Dr Chris and Dr Xand look at what medicine was like in the First World War and meet a Paralympian runner who swaps her awesome blade for a World War I leather leg.
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