BBC
Saving the world's last West African giraffes in Niger
The highly threatened subspecies has been brought back to a reserve in Niger after a 50-year absence.
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What is that bright object next to the moon?
A spectacular sight lights up the sky as Venus and the moon rise together
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Albert Einstein's 'God letter' expected to sell for $1.5m
The 1954 letter about religion is expected to fetch up to $1.5 million at auction in New York.
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Research worms 'too old' to go to space station
A launch is delayed due to mouldy food bars, meaning the worms could be a day too old for research.
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West Mersea mammoth tusk 'dates back 12,000 years'
It was discovered off the Essex coast after an unusually low tide exposed it for about half an hour.
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World's strangest sharks and rays 'on brink of extinction'
A shark that uses its tail to stun prey and a ray half the length of a bus are on the list of 50 species.
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A journey underground into one of Poland's working mines
As Poland hosts COP24 in nearby Katowice, David Shukman journeys into the depths of a working mine.
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House in a lab
Scientists have rebuilt a terraced house inside a laboratory to help make UK homes energy-efficient.
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Bacton Gas Terminal to be protected by sandscaping plan
A nationally important terminal on the Norfolk coast is to be protected by a new "sandscape".
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Osiris-Rex: Nasa probe arrives at Asteroid Bennu
Nasa's Osiris-Rex spacecraft moves alongside the 500m-wide rock from which it hopes to grab a sample.
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Gravitational waves: Monster black hole merger detected
Laser labs sense gravitational waves from a black hole collision at least five billion light-years away.
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Soyuz rocket: First astronauts launch into space since failure
Three astronauts from Russia, Canada and the US left from Kazakhstan on Monday morning.
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Climate change: 'Trump effect' threatens Paris pact
President Trump's actions are restricting global efforts to cut carbon, a study suggests.
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Sacked man claims discrimination against his 'ethical veganism'
Jordi Casamitjana wants to have ethical veganism recognised as a philosophical belief, in a landmark legal action.
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Climate activist: 'It's high time that Poland phased out coal'
Almost 80% of Poland's electricity is generated by coal. Patryk Bialas says it's time that changed.
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Climate change: Urgency the main theme as COP24 opens
The most significant conference on climate change since the 2015 Paris agreement opens in Poland.
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Why some see Chile's plastic bag ban as a rubbish proposal
Chile has banned stores from handing out free plastic bags to shoppers and it is a headache for some.
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Woman takes in grey squirrel found injured in Somerset
The squirrel, named Horatio, was acting "really confused" when found by the side of the road.
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Climate change: Where we are in seven charts and what you can do to help
As representatives gather in Poland for talks on climate change, we look at how hot the world has got and what can we can all do to tackle global warming.
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Nation's botanical treasure troves 'under huge threat'
The UK's herbaria are great scientific collections that must be safeguarded for the future, say scientists.
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