In the third episode of the series that puts science and technology to the test, the team face more fun experiments and challenges. And why not join in with our debate on the size of the universe: read Dr Andrew Norton's article below, which may help you get your head round just how big, big can be!
Tonight Liz conducts an experiment into jet lag and how to avoid it.
Dallas demonstrates the size of the solar system with the help of a bicycle and a fruit bowl.
And Jem upgrades his square-wheeled skateboard.
First broadcast on 22 September 2010
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The distances in space, even to one of our nearest galactic neighbours, are phenomenal. Dr Andrew Norton helps us... Read more: Galaxies apart: Join the debate
Dr Alan Cooper discusses the methods used to measure the Solar System. Read more: Measuring the Solar System
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Square wheels - odd looking indeed - but what would be the practical application for everyday life? See what Dr Ian... Read more: Reinventing the square wheel: Join the debate
How do helicopters beat gravity to fly? Download videos explaining all - and more about The Physical World. Read more: From the OU on iTunesU - The physical world
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