Operation Ouch

Twins doctors Chris and Xand van Tulleken explore their way through medicine and biology.

Meet two new Ouchers, and find out how eye muscles work with an unusual fairground game.

The doctors make Billy Bones his very own bum and reveal the power of your gluteus maximus muscle!

The doctors super-size the heart to investigate the piece of body kit that makes it beat.

Twins doctors Chris and Xand van Tulleken explore their way through medicine and biology.

The doctors reveal the incredible energy stores that make your body work around the clock!

The doctors try to find out how enzymes speed up chemical reactions inside the human body.

Twins doctors Chris and Xand van Tulleken explore their way through medicine and biology.

Twins doctors Chris and Xand van Tulleken explore their way through medicine and biology.

Twins doctors Chris and Xand van Tulleken explore their way through medicine and biology.

The doctors explore blood types and reveal how your blood fights off unwanted invaders.

The doctors hit the road in the Ouch Taxi to surprise the winners of this year's Ouch! Awards.