Rio Summit? More like the absolute nadir
Rio +20 revealed a shocking deficit of political will, but there are reasons to cling on to optimism, says Fred Pearce
Earth Summit signals move to give nature a price tag
UN environmental diplomacy hit the buffers in Rio de Janeiro. In future, green action will come about through economic self-interest or not at all
Universal speech translator app ready for Olympics
The app lets users speak to foreigners in their own language, which will help London tourists during the 2012 Olympics next month
Conversing computers trip up on pop
If you want to work out if you're chatting to a bot, ask about Star Wars and the Rolling Stones. Dan Falk reports on judging the Turing test
First synthetic larynx part transplanted
A synthetic windpipe attached to base of voicebox is successfully transplanted into two patients in Russia
First full universe simulation zooms in on dark matter
See what the structure of dark matter might look like thanks to the largest and most detailed universe simulation to date
Freicoin: Occupy's online currency for the 99 per cent
Freicoin, a version of the online currency Bitcoin, would make it impossible for the 1 per cent to hoard cash
Future-predicting system cuts app loading time
A system called predictive caching guesses which app you are about to use then preloads it so that it boots faster
Cruel cuts: Is all breast cancer surgery necessary?
Efforts to catch breast cancer early mean some women could be having surgery for lumps that would never become deadly, says Tiffany O'Callaghan
Summer ice clouds shine high above the Earth
You don't have to be a druid to have a mystical experience around the summer solstice - see the immaterial appeal of polar noctilucent clouds seen from orbit
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