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 on March 21st at 7.30pm; BBC One Wales on March 23rd at 7.30pm; and BBC One Scotland & Northern Ireland on March 25th at 8.30pm. Full schedule and iPlayer links are on bbc.co.uk.
In this week's programme, 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.