Bang goes the Theory puts science to the test once more.

The team start by looking at the science behind the recent volcanic ash crisis that has grounded Europe's planes.

In the rest of the programme, Jem Stansfield visits a power station to explain why steam is still powering the country, while Dallas hits the slopes to discover the science behind skiing.

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