Take it further
Got a passion for science? Find out about studying science at The Open University.
Play with DNA - on your fridge
Have you tried: The scratch-and-sniff experiment?
Bang on TV
Bang Goes The Theory returns to BBC One England and Wales on April 11th at 7.30pm; and in Scotland and Northern Ireland later in the week. Full schedule and iPlayer links are on bbc.co.uk.
On the 50th anniversary of the invention of the laser, Jem Stansfield explains how they work and builds himself a homemade one, Dallas Campbell looks at the rise of Citizen Science and takes part in the research projects that need people power, and Dr Yan recreates a demonstration to calculate the speed of light.