Medical research that uses animals to test therapies for human brain disorders is often biased, claiming positive results and then failing in human trials, U.S. researchers said Tuesday.

The findings by John Ioannidis and colleagues at Stanford University could help explain why many treatments that appear to work in animals do not succeed in humans.

Palaeontologists in Utah on Wednesday said they had found the fossil of a strange horned dinosaur which roamed an island continent known as Laramidia.

Dubbed Nasutoceratops titusi, the creature lived during the Late Cretaceous about 76 million years ago.

U.S. Secretary of State John Kerry vowed Wednesday to keep up the battle to set up a sanctuary to protect the unique marine ecosystem in parts of the Antarctic.

And he voiced "regret" that attempts to create the world's largest ocean sanctuary in the Ross Sea were blocked, with environmental groups accusing Russia of raising objections to the move.

British scientists on Tuesday reported they had harnessed the power of urine and were able to charge a mobile phone with enough electricity to send texts and surf the internet.

Researchers from the University of Bristol and Bristol Robotics Laboratory in south west England said they had created a fuel cell that uses bacteria to break down urine to generate electricity, in a study published in the Royal Society of Chemistry journal Physical Chemistry Chemical Physics.

The fearsome bite of a hungry Tyrannosaurus rex left behind new evidence that the famous beast hunted for food and wasn't just a scavenger.

Researchers found a part of a T. rex tooth wedged between two tailbones of a duckbill dinosaur unearthed in northwestern South Dakota. The tooth was partially enclosed by regrown bone, indicating the smaller duckbill had escaped from the T. rex and lived for months or years afterward.

A tiny new moon has been spotted circling Neptune -- the 14th known to be orbiting the faraway planet, the US space agency said on Monday.

The moon is the smallest ever glimpsed around Neptune and measures just about 12 miles (19 kilometers) across, based on observations from the Hubble Space telescope, NASA said.

U.S. regulators on Monday approved the first brain wave test for attention deficit hyperactivity disorder, saying it may improve the accuracy of diagnoses by medical experts.

Cases of ADHD are on the rise in the United States, as are the number of prescriptions for stimulants doled out to young people who appear to have difficulty concentrating or controlling impulses.

Five Southeast Asian nations meet later on Monday to discuss the hazardous smog that blights the region every year but the affected countries hold little hope of a permanent solution.

The officials from five ASEAN countries that form the bloc's "haze committee" will hold two-day talks on Indonesian forest fires before environment ministers head into a showdown Wednesday.

Several dozen Greenpeace campaigners snuck into a nuclear plant in southern France at dawn on Monday, in the latest such break-in by the environmental group.

The activists managed to enter the grounds of the Tricastin plant, some 200 kilometres (120 miles) north of Marseille, at around 5:00 am (0300 GMT), Greenpeace and police said.

Countries that regulate fishing in the Antarctic are meeting in an effort to break an impasse over proposals to create marine sanctuaries off the continent's coast.

The Commission for the Conservation of Antarctic Marine Living Resources, which brings together 24 countries and the European Union, meets Monday and Tuesday in the German port city of Bremerhaven.