The team sets out to discover what is behind our special relationship with dogs. Liz visits researchers comparing dogs to wolves to see how domestication has shaped canines and Philippa Forrester finds out how dogs really can be good for your health. watch
The team looks at some of the biggest travel nightmares. Liz investigates what causes traffic jams, whether lane switching works, and how to beat travel sickness. Meanwhile Jem heads for his workshop to build his own home-made, man-powered airplane. watch
Jem dreams of flying by pedaling a homemade plane into the air. Meanwhile, Liz explores how hormones and blood sugar affect our energy levels and mood, and Dallas tries to answer the question 'Do we really need to drink eight glasses of water a day?'. watch