What do summits achieve?

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The war of words seems to be intensifying ahead of the global G20 summit. But what do events like this ever actually achieve? Our economics correspondent Andrew Walker - who's been to them all - gives us his considered view. And after months of mutual fear and loathing within the Eurozone, we meet a Greek and a German who actually quite like each other. Elena Panaritis and Dr Markus Kerber are both economists who have the ear of their governments' finance ministers, and both are urging a new spirit of dogged solidarity amongst Europe's citizens. Plus how much does running an army cost in Africa? It turns out to be a tough question to answer, according to our regular letter-writer, Wycliffe Muga.