Chinese telecoms firm Huawei hits back at report by American politicians which claims it is a security threat.

Nasa says it will launch a new rover to Mars in 2020, to be based on its Curiosity robot, which landed on the Red Planet in August.

Retail magnate Sir Philip Green is in talks to sell off part of his Top Shop chain to US investors, sources have said.

Fugitive software pioneer John McAfee crosses into Guatemala after weeks on the run from Belize police, who want to speak to him about the murder of his neighbour.

The sperm count of French men fell by a third between 1989 and 2005, a study suggests.

More babies who are born prematurely - before 26 weeks gestation - are surviving than ever before, according to a detailed study of births in England.

Scientists say they have developed a breath-test that can accurately tell if a person has bowel cancer.

Palaeontologists identify what is likely to be the oldest known dinosaur specimen, patching a 10-15-million-year hole in dinosaurs' evolutionary history.