4/6 Dallas looks at the origins of our weather, with the help of a grenade launcher.
3/6 Dallas demonstrates the size of the solar system using a bicycle and a fruit bowl.
3/6 Dallas demonstrates the size of the solar system using a bicycle and a fruit bowl. (R)
2/6 Liz looks at the science of sunburn, while Dallas tries to make museum visitors younger. (R)
1/6 The team investigate the recent Gulf of Mexico oil disaster, and Liz travels to Louisiana.
6/6 Jem is challenged to build a boat made out of ice, and take it and the team for a spin. (R)
BBC One Northern Ireland