Dallas downs his toothbrush to discover what causes tooth decay and gum disease.
Liz investigates bedbugs, and Yan explains why statistics are not to be trusted.
Liz Bonnin visits the north Lake District, starting her journey at Whinlatter Forest.
Topics include new stem-cell research and the Nocebo effect (placebo's evil twin).
Jem witnesses the awesome power of rockets with the Bloodhound land speed record project.
Liz hits the beach with the RNLI to experience the power of rip currents.
Jem makes his own diamond and then proves they aren't forever.
Liz Bonnin is getting to grips with a family of foxes at a landfill site in Essex.
Chris Packham and Martin Hughes-Games reveal the wild side of Newcastle.
Kate Humble, Chris Packham and Liz Bonnin answer audience questions.
The marathon live wildlife event reaches its climax.
Liz Bonnin begins her exploration of a landfill site in Essex.