Will Dilma Rousseff's Workers Party be able to boost the country's economy?
3/4 The caesium-based atomic clock has redefined the very meaning of time
Can our cities cope in the face of rapid urbanisation?
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Britain is the biggest loser as the EU demands more money from some member states.
Do shoppers need, or want to pay for goods with their mobile phones?
On his hope for new ways to break down national barriers