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The doctors find themselves in a crazy race as they explore the bones in your feet.

Dr Xand invents a facial-recognition system to keep his twin out of the lab.

There's a lizard in the lab sharing an amazing piece of body kit with you.

Dr Xand has created a thunder tube to show you how your vocal tract makes your voice loud.

Find out why Dr Chris is giving Dr Xand a vaccination in the lab.

Dr Xand races Dougie the dog to show you how your shoulders work.

Dr Chris challenges Dr Xand to beat Dougie the dog in a race.

Find out why and what you need your kneecaps for in today's lab.

Dr Xand performs an experiment to show how your brain tells your muscles to move!

Dr Chris sets Dr Xand the impossible task of being Mini-Xand鈥檚 pituitary gland.

A tug of war in today鈥檚 lab shows the incredible strength of your ligaments.

Dr Chris puts Dr Xand inside a giant water balloon to show how viruses attack our bodies.

The doctors revisit Ouchers from across the last seven series to find out how they are.

The doctors investigate food and poo to show you why it is important to know what you eat.