Katty Kay in Washington and Christian Fraser in London report on the events that are shaping our world.

Michael Portillo continues his journey from Pembroke Dock to Cambridge. En route, he learns about the Victorian signalling system still in place today. Show more

Helen Czerski uncovers what colour is, how it works and how it has written the story of our planet. She seeks out the colours that turned the Earth multicoloured. Show more

Jim Al-Khalili tells the story of the great leap in scientific knowledge that took place in the Islamic world between the 8th and 14th centuries. Show more

Rageh Omaar finds out why, if human depiction is the source of such controversy in Islamic art, it can be found in many of the artworks on show at a British Museum exhibition. Show more

David Malone's documentary delves into the secrets of ocean waves, revealing that waves are not made of water, that some waves travel sideways and more. Show more

Nature documentary looking at wildlife from the perspective of tiny creatures - a baby African elephant shrew and an American grasshopper mouse. Show more

A lyrical portrait of the Wye Valley through the eyes of a cider maker, a salmon fisherman, a sheep farmer and a beekeeper. Show more

Jim Al-Khalili tells the story of the great leap in scientific knowledge that took place in the Islamic world between the 8th and 14th centuries. Show more

Helen Czerski uncovers what colour is, how it works and how it has written the story of our planet. She seeks out the colours that turned the Earth multicoloured. Show more