In the second episode of the series, Liz follows two couples undertaking IVF and looks at the new research that may dramatically increase success rates. Jem attempts to become the first man to go 360 degrees on a playground swing. And Dr Yan confuses shoppers with the help of a very special mirror.
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.