The latest stories from the Science & Environment section of the BBC News web site.
Updated: 8 min 35 sec ago
All but essential travel to Sierra Leone, Guinea and Liberia should be avoided, the Foreign and Commonwealth Office warns British nationals.
Astronomers have shown that dead stars known as white dwarfs can re-ignite and explode as supernovas.
Scientists in Iceland say they are examining several depressions, termed 'cauldrons', near Bardarbunga volcano, which could be a sign of an eruption.
US defence giant Lockheed Martin is teaming up with an Australian technology firm to track space debris that can damage multi-billion dollar satellites.
A study by the National Trust suggests seabirds around the UK coastline are being hit by a "triple whammy" of extreme weather, predators and disturbance by humans.
The birth of a pair of rare bongo antelopes in captivity is "fantastic news" for the "critically endangered" species, say conservationists.
Could unused TV signal improve rural broadband?
Over the decades tonnes of disposed tents, spent oxygen cylinders and bottles have been left behind on Mount Everest by people trying to scale it. Now authorities are urging them to bring the waste back down with them to recycle it.
Rape-prevention tool draws online backlash from anti-rape advocates
Neuroscientists artificially turn a mouse's fearful memory into a positive one, and vice versa.
A pest controller takes on the "biggest job of his career" when he is called to deal with a nest of more than 5,000 wasps.
Ten groups have been chosen as finalists in a $10m (£6m) competition to develop a real-life "tricorder" - the medical scanner used in Star Trek.
California has been hit by its worst drought in a century and many say the problem is only going to get worse.
BBC Newsnight's Stephen Smith visits Dover to assess how much of a threat buddleia is to native species
Overnight earthquakes raise fears that magma from Iceland's Bardarbunga volcano could be heading towards another large volcanic system, scientists say.
Why so many of us are developing allergies
A farmer explains his relationship with his sheepdog, after researchers help unravel the mystery of how the animals do their job.
Scientists produce a simple mathematical model that explains how a single sheepdog can herd a large number of sheep.
The climate impacts of the world's fossil-fuelled power plants are being underestimated because of poor accounting, say researchers.
A target number of badgers to be killed in this year's pilot cull to tackle tuberculosis in cattle is announced.