1/3 A new baby is born, but her first few weeks look set to be the most dangerous of her life.
2/5 Steven Johnson discovers the surprising journey of time in our lives.
4/12 Chris Packham explores how ants have collaborated to achieve their global success.
1/8 Alan Titchmarsh travels the British Isles to look at what makes our wildlife so special.
10/31 Neil Oliver visits an Atlantic sea monitoring station off the coast of Galway.
5/6 Northern Africa is home to the greatest desert on Earth, the Sahara.
4/6 David Attenborough reveals the vibrant environment of southern Africa.
The discovery of a world which may have habitats capable of supporting life.
3/6 David Attenborough journeys to the heart of Africa, which is covered in dense rainforest.
In the final two months of the diet, the volunteers' bodies are fighting back.