The team reveals how life surrounded by wireless signals affects us. Howard Stableford looks at the health risks, and Jem explores electricity without wires.

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 solution to traffic jams: a home-made, man-powered aeroplane.