Presented by James Naughtie and Evan Davis. Zimbabwe is preparing for the run-off presidential election. Peter Biles reports from Johannesburg. Technology correspondent Rory Cellan-Jones talks to Craig Braithwaite, who explains what kind of skills are needed to be a games engineer. Why are lions and leopards being deliberately poisoned in Kenya? Adam Mynott reports from the Masai Mara game reserve. The government has warned of the need for discipline in public and private sector pay to keep inflation under control. Reporter Martin Shankleman discusses whether unions will be demanding higher wages. In a letter to the Times newspaper, 12 research scientists have urged the government to spend more on dementia research. Professor of Neuropathology Roy Weller explains why he signed the letter. Chancellor Alistair Darling delivers his first Mansion House speech about the state of the economy. What can he do to convince his City audience - and the rest of us - that he is in control of the economy in this difficult time? The first computer-generated music has been unearthed. Chris Burton, from the Computer Conservation Society, and the Daily Telegraph's rock critic Neil McCormick listen in. Time magazine columnist Joe Klein analyses Hillary Clinton's chances of running for the US vice presidency.