BBC News - Science & Environment

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The first ever recordings from single brain cells during REM sleep suggest that flickering eyes accompany "scene changes" in a visual dream.
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Engineers develop a robotic system that evolves and improves its performance.
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Dutch artist Daan Roosegaarde's project cleans polluted air and allows the smog particles to be turned into jewellery
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IAAF retests from the 2005 and 2007 World Championships return "adverse findings" for 28 athletes tested for doping.
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How does Australia's pledge on carbon emissions compare in the run-up to the Paris climate summit?
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Skywatchers are in for a dazzling display as the annual Perseid meteor shower reaches its peak on Wednesday.
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Why is Japan restarting the Sendai reactor?
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A second attempt to reintroduce an extinct bumblebee to the UK is proving successful, conservationists say.
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A survey examining 200,000 galaxies in multiple wavelengths offers the best estimate yet of how fast the Universe is fading.
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Skywatchers are in for a dazzling display as the annual Perseid meteor shower reaches its peak on Wednesday.
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Astronauts on board the International Space Station (ISS) sample some space-grown lettuce.
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A toxic leak of wastewater that has turned a Colorado river mustard yellow is three times larger than US officials had originally estimated.
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Drought sensitive butterfly species could be driven to extinction across the UK by 2050 according to new research.
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Technology being developed at the nuclear spent fuel facility at Sellafield, Cumbria, could prove highly lucrative in the growing business of industrial clear up.
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Bee-killing Asian hornets spreading across Europe are fatally attracted to a carnivorous plant, French experts say.
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A group of divers in Cornwall are engaged in an underwater clean-up, in a bid to stop plastic rubbish damaging marine life.
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At least 170 people have been killed in Pakistan in this year's monsoon rains.
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How far are they going in the battle to save India's strays?
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Cuban people are getting round a lack of internet access by having a weekly delivery of content by hand.
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Six suspected tiger poachers are shot dead in a gunfight with Bangladeshi police in the world's largest mangrove forest, the Sundarbans.
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The data scrambling systems used by millions of web servers could be much weaker than they ought to be, say researchers.
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Scotland is to ban the growing of genetically modified crops, the country's rural affairs secretary announces.
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The Panama Canal says it will temporarily cut the size of ships allowed through because drought caused by El Nino has lowered water levels.
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Frances Oldham Kelsey, the Canadian doctor who played a central role in preventing thalidomide being distributed in the US, dies at 101.
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Physicists unveil a raft of new findings about neutrinos bombarding the Earth from above, below - and within.
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