Exploring the secret world of the biological clock.
Featuring an experiment that aims to reveal why it is hard for some people to gain weight.
Brian Cox explores the mysteries of time, discovering that a day is never 24 hours long.
1/6 The team starts in London and then explores the curious coast of Belgium.
A scientific investigation into the meaning of dreams, drawing on personal testimony.
1/2 Ellie Harrison ventures down one of the deepest gold mines in the world.
3/6 The new year starts with some of the biggest snowstorms for years.
4/4 Iolo Williams visits a park in Pontypool that is home to thousands of nesting bees.
Matt Baker discovers a piece of equipment being used to enable wheelchair users to abseil.
The team are in the Highlands of Scotland following in the footsteps of poet Robert Burns.