BBC

Physicists have created a fluid with negative mass, which accelerates backwards when pushed.

A postbox gets the stamp of approval from a pair of nesting birds.

A study that attached cameras with suction cups to the backs of Antarctic whales has revealed never before seen feeding habits and social interactions.

A new resident off the coast of a Canadian town has turned it into a cool tourist spot.

When a team of scientists went to the Yukon to study the Slims River, all they found was a "skinny lake".

Some of them may know where to find food but not how to access it while others know how to get at it but not where it is hidden.

The BBC's Sir David Attenborough will show people "natural treasures" within the new Google Earth.

Good management of mega-constellations of spacecraft can avoid polluting the orbital environment.

The two brown bears were found by Ukrainian charity Four Paws.

Scientists find live specimens of the giant shipworm, described as "rare and enigmatic".

Poaching, illegal logging and fishing are threatening some of the world's most iconic natural heritage sites.

Work has now started on a new super-sewer that's big enough to deal with London's waste.

Environmentalists urge the UK not to water down laws on climate change and wildlife after Brexit.

Nasa believes one of Saturn's moons may be the best place to look for life beyond Earth.

Enceladus has the conditions, including a key energy source, to enable microbes to exist, Nasa says.

Diver Keith Brock and his wife capture a rare close-up video of the shark off the east coast of the United States.

A new fossil suggests an early relative of dinosaurs had some features we associate today with crocodiles and alligators.

Scientists from the University of California in Berkeley have figured out why.

The end may be in sight for one of the world's longest-running series of manual weather records.

The authors say the research can be applied to other structures, such as DNA.