BBC

Scientists begin examining rocks drilled from the crater dug out of Earth's crust by the asteroid impact that killed off the dinosaurs.

President Barack Obama says the US will work with private companies on its plan to send humans to Mars in the 2030s.

A bottlenose dolphin is pictured flipping a porpoise into the air in a deadly attack.

Hundreds of thousands of householders in flood risk areas have failed to install basic protection against rising waters, insurers say.

Russian social media site launches platform for pets.

The European Schiaparelli probe will make its landing attempt on Mars prepared even to handle dust storms if that is what the planet throws up, the mission team says.

A huge drop in the number of butterflies in the UK is causing confusion among wildlife experts.

More than 100 scientists from 28 countries have called for global action to protect seagrass meadows, which provide food and shelter for fish, marine mammals and birds.

Aspinall Foundation's Port Lympne wildlife park in Kent has praised the arrival of two critically endangered black rhino calves in Tanzania.

Ten years ago an earthquake detected in North Korea turned out to be the country's first ever nuclear test. Seismologist Mika McKinnon explains how scientists tell the difference.

Astronaut Chris Hadfield discusses with Sarah Montague the importance of fear.

Conservative US blogger Matt Drudge suggests warnings over Hurricane Matthew are a government conspiracy, but critics say his comments are wrong and dangerous.

A humpback whale which was stranded on a sandbank off Australia frees itself after its calf was filmed apparently pushing her into deeper water.

Nobel laureates are getting older in every field but one. Could it all be down to quantum mechanics?

Levels of beneficial omega-3 oils in farmed salmon have fallen significantly in the past five years.

A landmark deal has been struck by the aviation industry to limit greenhouse gases, but environmentalists are unimpressed.

Young African scientists show off their inventions, including a prototype of flying car, at an expo in the South African city of Johannesburg.

Scientific detective work on fossils collected in Victorian times has identified two new species of ichthyosaurs - the giant sea reptiles that swam at the time of the dinosaurs.

Half a century of the planet's volcanic eruptions and earthquakes go online in a unique animated app.

Half a century of the planet's volcanic eruptions and earthquakes go online in a unique animated app.