The latest stories from the Science & Environment section of the BBC News web site.
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The man who found a way to fix his own heart
More than 200 million people around the world are at risk of exposure to toxic waste globally a study has found.
UN climate negotiations are bogged down in a dispute over who will take legal responsibility for the loss and damage caused by climate change.
Fruit bats harbour more deadly viruses than was previously thought
The first completed tunnel in the £14.8bn Crossrail project is unveiled.
Fish farmers are rearing thousands of "cleaner fish" in the hope they will be able to guard Scotland's salmon stocks from a deadly parasite.
Astronomers are getting good views of Comet Ison, which has been brightening over the last two weeks - but it has yet to live up to its billing.
Delegates at UN climate summit wrestle with two fossil fuels
A £1.4m observatory for nature lovers to get a better look at breeding ospreys and other wildlife is near completion at a reserve.
Who buys a 17m-long diplodocus dino fossil?
Female mice that compete in promiscuous environments have sexier smelling sons, research finds.
Britain's wildlife is not being protected because the government is failing to meet its own targets, a report from group of charities suggests.
The government is failing to deliver a third of its commitments to protect the natural environment, a report by an umbrella group says.
A zoo in the US state of Texas is investigating why a male lion suddenly attacked and killed a lioness in full view of visitors on Sunday.
The US space agency's Maven probe launches on a mission to try to understand the processes that have robbed Mars of most of its atmosphere.
Volcanic Mount Sinbung in Sumatra, Indonesia, erupts, while Mount Etna, Italy, blows smoke rings.
China's Tianhe-2 retains its status at the peak of the Top500 list of supercomputers, but IBM believes there are problems with the way it is calculated.
Is it right to waste helium on children's balloons?
Nasa's Maven mission launches on Monday, aimed at studying how and why Mars lost its atmosphere, once thought to be similar to Earth's.
How close are we to understanding dark matter?