The controversial idea that space impacts wiped out mammoths and early humans in North America receives new impetus.

Police investigate the cause of a fire in a Bangkok nightclub that killed 59 people, amid reports that fireworks were to blame.

Testing a lung cancer patient's blood could help doctors predict the likely success of chemotherapy treatment.

How 200-year-old paintings can help modern engineers deal with coastal erosion, a study shows.

Experiments in rats may have revealed why some painkilling drugs are less effective in women compared with men.

Pupils and staff at a Hampshire school are left baffled over sightings of a purple-coloured squirrel.

University researchers find evidence of a massive meteorite shower in the far north of Scotland.

A missing jacket may provide clues about the shooting of a teenage boy on a disused Liverpool railway line, police say.

Police release audio of a suspect they believe could be behind five armed robberies in the Oxford area.

The shooting of Rhys Jones prompted the beginning of a long and painstaking investigation to find his killer.

BBC Scotland's home affairs correspondent, Reevel Alderson, on the mobile phone evidence which helped convict the plotters

Scientists have travelled the world looking for clues to explain the rise of asthma and other allergies.

The workings of our body clock appear to be directly connected to our risk of diabetes, researchers claim.

The UN body investigating the killing of Lebanese ex-Prime Minister Rafik Hariri says fresh evidence could help identify new suspects.

The BBC's James Cook reports on how Vicky Hamilton's killer Peter Tobin left a trail of clues which led police to him.

A 97-year-old document containing clues to the identity of Eleanor Rigby, the subject of the Beatles hit, sells at auction.

A US team produces a computer model to predict the rate at which ice shelves break apart into icebergs.

The scale and sophistication of attacks on Mumbai have left residents shocked - and no clues yet to who is behind them.

A faulty immune reaction may be responsible for the development of epilepsy, research suggests.

In the automotive industry, car companies must invest in all potential technologies, or they run the risk being wrong. "And if you're wrong," says GM president Fritz Henderson, "it can threaten your firm."