The stories behind the week's news: what's led to this outbreak of fighting in Yemen? Who stands to lose and who to win? Why some are not convinced about the deal reached in Lausanne on Iran's nuclear programme. The Nigerian election: a great moment for democracy but the new president faces a people with high expectations. The steady growth in the wealth of some Chinese - it means consumption is now more important than investment in driving the nation's economic growth. And the mighty money spinner that is coffee -- where on earth can you find the most delicious cup of all?

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