African leaders gather for a major summit in Washington, DC

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We ask what US President Barack Obama can actually do for Africa's economies. And from Liberia we hear how much still needs to be done to meet basic infrastructure needs, such as electricity, in many parts of Africa. Plus, the companies still trying to build business ties with Libya - despite the violence there. Also coming up - while the bosses are on holiday - how to be lazy at work, and get away with it. Tips from Lucy Kellaway of the Financial Times!