In the latest episode of the series that reveals your world with a bang, Jem demonstrates what a calorie is by making the team take part in the Oxford and Cambridge Boat Race. Dr Yan goes to the Houses of Parliament to meet MPs and test their ability to calculate risk. And Liz investigates whether we are running out of antibiotics and what will happen if we do. Bang also launches the Big Risk Test - take part in what aims to be the biggest ever study of the science of risk.

The programme is co-produced with the Open University. For more ways to put science to the test, go to www.bbc.co.uk/bang and follow the links to the Open University. Show less