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The doctors reveal the special fluid which enables your joints to withstand force.
The doctors reveal the amazing piece of body kit that helps your ears to pop.
The doctors take a dip in the sea to reveal how sensory neurons detect hot and cold.
The doctors reveal how big your lungs would be if they were laid out flat.
The doctors reveal why you need differently shaped teeth to eat your food safely.
The doctors investigate why we need eyebrows.
The doctors reveal how your brain enables you to learn new things.
The doctors find out why blood rushes to your head when you are upside down.
Dr Chris and Dr Xand reveal how your bones grow to make you taller.
Dr Chris and Dr Xand reveal the type of muscles that help you see... and go for a poo!
Dr Chris and Dr Xand reveal how your skull protects your brain.
Dr Chris makes Dr Xand cry to demonstrate how your body makes different types of tears.
In the last episode of the series, the doctors pick out some of their favourite moments.