In a case of science fiction meeting reality, microscopic machines have journeyed inside a living animal for the first time.
The new kidnappings in Cameroon by Nigeria's Boko Haram militants suggest the crisis is increasingly becoming a regional one, the BBC's Will Ross in Lagos reports.
Gareth Warburton and Rhys Williams were at fault or negligent says drugs panel report published into failed doping tests.
QPR chairman Tony Fernandes says Harry Redknapp will remain as the struggling Premier League club's manager.
Kenyan police fire tear gas at pupils of a Nairobi government school protesting about the sale of their playground to a private developer.
The first major UK exhibition on the fashion of Yves Saint Laurent is to be staged at the Bowes Museum in County Durham later this year.
Prime Minister David Cameron defends a letter signed by ministers urging Muslim leaders to explain how Islam "can be part of British identity".
Petra Kvitova talks about life on the road with Team Petra in the Wimbledon champion's first BBC Sport column.
An aircraft with 47 passengers and two crew onboard comes off the runway at Inverness Airport.
An Argentine federal prosecutor who accused President Cristina Fernandez de Kirchner of a cover-up has been found dead at his home in Buenos Aires.
Saudi Arabia can cope with low oil prices for "at least eight years", Saudi Arabia's petroleum minister's former senior adviser has told the BBC.
Haitian President Michel Martelly has announced the formation of a new government which is to be sworn in on Monday.
Rebels in eastern Ukraine reject the government's claim that its troops recaptured most of Donetsk airport, as fighting continues.
Three Britons will be involved on day two of the Australian Open as they attempt to join Andy Murray in round two.
A man admits murdering his wife, who was found dead at their home in west London decapitated and with stab wounds and broken bones.
British Gas becomes the latest energy firm to announce a household gas price cut, promising a 5% fall in late February.
Argentine prosecutor Alberto Nisman, who accused President Cristina Fernandez of a cover-up over the 1994 bombing of a Jewish centre, is found dead.
Legendary Indian cartoonist RK Laxman, 94, is in a critical condition in hospital after suffering multiple-organ failure, doctors say.
The mother of a schoolboy murdered by a man he met through online gaming says it is "appalling" police missed previous allegations about the killer.
The former Korean Airlines executive, Cho Hyun-ah, has appeared in court in Seoul accused of violating aviation safety laws and endangering passengers.