Dallas downs his toothbrush to discover what causes tooth decay and gum disease.
A look at how our ideas about dinosaurs have changed over the past 40 years.
Liz investigates bedbugs, and Yan explains why statistics are not to be trusted.
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.
Dallas Campbell asks if science will save us when Armageddon arrives.
A look at how our understanding of intelligence has transformed over the last century.