5/6. lain Stewart tells the story of man's 10,000-year battle with water. Because water is so crucial, ancient civilisations had to learn how to exploit it. From the flooding of Stone Age hunting grounds to the fall of the Roman Empire, water was pivotal. Today we ignore it at our peril. Filmed in Greece, Spain and Jordan.

8.00 6/6. Salt has played a role in everything from the ice ages to the preservation of food and dead bodies in ancient Egypt, lain Stewart investigates.