BBC News

A change in just a single 'letter' of the flu virus allows bird flu to pass to humans, according to scientists.

The comet visited by the Rosetta spacecraft is constantly being re-shaped, sometimes in dramatic fashion, a study suggests.

Earth's history is recorded in the magnetisation of its hard, outer shell.

Striking workers block the roll-out of the booster at the Kourou spaceport in French Guiana.

Too little new woodland is being created in England, say MPs, amid warnings of a "tree planting crisis".

The world continues to experience extreme climate trends after a record breaking 2016, says WMO.

Researchers discover five new sub-atomic particles that could help to explain how atoms are held together.

Knowing why some sperm succeed and others fail could help treat male infertility, researchers say.

How a sperm manages to reach the fallopian tubes is clear at last, scientists say.

The SpaceX Dragon capsule returns to Earth after its mission to the International Space Station.

How a remote community in Guyana is using cutting-edge software and equipment against deforestation.

The second man to set foot on the Moon, launches a virtual reality movie detailing his plan to get humans to Mars.

Taronga Zoo's baby pygmy hippopotamus - the first born in seven years - has made its first public appearance.

Researchers in the US are working with dolphins in an effort to work out why closely related whale species in the wild strand themselves on land.

Science correspondent Rebecca Morelle describes her violent encounter with Europe's most active volcano.

A computerised system for injecting medicine without using needles has won an innovation award at the South by SouthWest Interactive technology conference in Austin, Texas.

A bird that watched its own reflection for hours becomes the subject of internet fun.

Fifty years ago, the supertanker the SS Torrey Canyon hit rocks off the coast of Cornwall, spilling more than 100,000 tonnes of crude oil. But it was the clear-up operation that led to the real environmental disaster.

Researchers trace the parental history of Canadian rocks to a time just after Earth's formation.

Volcano watchers suffer cuts, bruises and burns as an explosion pelts them with hot rocks and steam.

Chile signs a historic deal with Kristine McDivitt Tompkins to create a "network of national parks”.

The UK's favourite yellow submarine is set to leave port for the Antarctic.

Chase planes flying behind a jet are providing new insights into aircraft pollution.

Germany will use its G20 Presidency to nudge world leaders towards a global price on carbon, say officials.

Record numbers of songbirds are still being killed on a British military base in Cyprus.

The art of science - captivating scientific images from the 2017 Wellcome Image Awards.

Astronomer Susan Murabana takes a telescope round Kenya to enthuse schoolchildren.

Could circular runways be the future of air travel? Aviation expert Henk Hesselink of the Netherlands Aerospace Centre believes so.

Extra cost of wind and solar power outweighed by energy saving, says report.

A deadly haze of air pollution over China in 2013 has been linked to the melting of Arctic sea ice.

Access to flower-rich habitats is key to the survival of wild bumblebees, say ecologists.

Hive heists in New Zealand are being blamed on the rising price of Manuka honey.

Soft drinks makers admit more needs to be done to stop people discarding single-use plastic bottles.

Scientists on both sides of the Atlantic have become embroiled in a war of words over energy from trees.

The world's spiders consume between 400 million and 800 million tonnes of primarily insect prey every year, say scientists.

The origins of plants may go back hundreds of millions of years earlier than previously thought, according to fossil evidence.

The ship damaged a large area of one of Indonesia's best coral reefs, in an area dependent on tourism.

B vitamins may offer some protection against particulate pollution, a small human trial suggests.

A giant green sea turtle has been released off the Florida Keys after convalescing from an injury.

Hector Ruiz has made it his mission to convert cars in Mexico City to run on electricity.

A video captures the moment plankton ingest a plastic microfibre.

Scientists say there hasn't been enough time for the corals to recover from damage in 2016.

A trial suggests that an Ebola vaccine could protect gorillas and chimps from the deadly disease.

Russian architect Alexei Umarov thinks his HyperFilter building could be a pollution solution.

Could smelly maps linked to the odours of a city play a role in fighting dirty air? Our environment correspondent Matt McGrath follows his nose.

Security could increasingly rely on smart machines that spot cyber threats rather than on humans.

The mid-air hunting strategy of a tiny fly the size of a grain of rice has been revealed by an international team of scientists.

We revisit Nemley Junior who was freed from wildlife traffickers in Ivory Coast after a BBC News investigation.

A tiny robber fly the size of a grain of rice has an advanced hunting strategy, researchers discover.

The scheme hoping to help parents steer their little ones away from exhaust fumes.