Bang Goes the Theory

In the latest of the series that puts science to the test, the team takes on more fun experiments and challenges. Dallas Campbell traces the incredible global journey of 30,000 indestructible plastic ducks, while Liz Bonnin goes on manoeuvres at the bottom of the Baltic Sea in the Royal Navy's latest search and rescue sub. Dr Yan Wong challenges the people of Cardiff to take on the might of friction, and Jem Stansfield uses two domestic vacuum cleaners to climb up the side of a building.

The team take on more popular science. Liz Bonnin investigates recent research into the magnetic qualities of cows, while Dallas Campbell puts psychological priming to the test. Dr Yan Wong demonstrates why rockets work in space with the help of an underwater firework, and Jem Stansfield tries to put the programme in the space race.

Jem Stansfield attempts to defeat the US Navy's latest weapon with no more than some foam and a crash helmet. Zoologist Liz Bonnin gets in contact with her frog brain, Dallas Campbell re-programmes his caveman brain to become a thrill-seeker, and Dr Yan Wong gets his thrills from inhaling sulphur hexafluoride.

Jem Stansfield takes to the air with the Royal Navy to explain how helicopters work, while Liz Bonnin puts brain training devices to the test. Dallas Campbell investigates the new space entrepeneurs in California, and Dr Yan Wong shows how to melt glass with a microwave.

Jem Stansfield tests out new braking systems that won't burn money, Liz Bonnin looks into the origins of speech by trying to wipe out someone's speech cortex, Dallas Campbell takes part in a sea race with Dame Ellen MacArthur to try and explain why British summers are rubbish and Dr Yan Wong explains a common optical illusion.

Jem Stansfield builds a microwave death ray to prove the existence of invisible and untapped energy, Liz Bonnin takes on the nature versus nurture debate with a troop of monkeys, Dr Yan Wong explains how gyroscopes work with the help of a couple of office chairs, and Dallas Campbell decides to save the world of physics from crisis by trying to find a missing bit of the universe.

Jem Stansfield puts spider silk - the strongest material in the natural world - to the test; Liz Bonnin joins the RAF's flight school to find out the truth about multi-tasking; Dr Yan Wong experiments with sodium acetate; and Dallas Campbell dusts off his top hat to reveal the secret science of magic.

The team take on more scientific challenges. Jem Stansfield decides to build a rocket powered by toffee and then thinks it would be a good idea to ride it. Liz Bonnin investigates our sense of smell and whether it can make us smarter. Dr Yan Wong demonstrates the connection between electricity and magnetism. And Dallas Campbell explains nuclear fusion by going to the circus.