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The US Environmental Protection Agecny (EPA) has ruled that carbon dioxide emissions may endanger human health and should be regulated – the latest sign of changing attitudes to science in the Obama administration.
Physical gestures – like nodding and shaking our head, the thumbs-up sign – are not a universal language after all. Scientists are improving the way humans communicate with computers. Discovery of a new exoplanet – a planet like our own orbiting another star. Computer research into whether the 400 written symbols of the 4,000-year-old Indus civilisation really represent a spoken language.

Presenter: Jon Stewart