Rubio Enters Presidency Race

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As Republican Senator Marco Rubio joins the long race for the US Presidency, we speak to Angie Holan, editor of the Politifact website about whether he's a real contender to Hillary Clinton. Sudan is holding elections to choose its president but is the outcome already decided? We hear from Dr Magdi al-Gazouli from the Rift Valley Institute about Sudan's troubles. A high school maths question from Singapore has gone viral - we try to find the answer with the help of author Alex Bellos. And Christopher Bernstein from the USDA tells us about an app it has launched to try and reduce household food waste. Our guests joining us throughout the show are Dilip Ratha, Head of Remittances at the World Bank in Washington and Tony Nash of Delta Economics in Singapore. And we're also joined by the BBC's Juliana Liu in Hong Kong.