The Director of the British Museum, Neil MacGregor, retells the history of human development from the first stone axe to the credit card, using 100 selected objects from the Museum. In a week that explores man's early experiments with numbers, Neil describes the British Museum's most famous mathematical papyrus. This shows how and why the ancient Egyptians were dealing with numbers around 1550 BC. It contains 84 different calculations to help with various aspects of Egyptian life, from pyramid building to working out how much grain it takes to fatten a goose. Neil describes it as 'a crammer for a dazzling career in an ancient civil service'.