Prince Harry ends his visit to the US by playing in a polo match for his charity that helps people affected by HIV and Aids in Lesotho.

The planet-hunting space telescope, Kepler, has been hobbled by a broken reaction wheel, say scientists at Nasa.

The White House releases 99 pages of emails related to the attack on a US mission in Benghazi, Libya, on 11 September last year.

Former American football star OJ Simpson makes his case for a new trial on armed robbery charges, saying he did not get proper legal representation.

President Barack Obama announces the head of the US tax agency has quit, after it emerged his staff singled out conservative groups for extra scrutiny.

The strange beauty of infections under the microscope

A California woman convicted of killing her former boyfriend can be executed because of the cruel and heinous nature of her crime, a jury rules.

US Attorney General Eric Holder faces hostile questioning at a fractious congressional hearing on two scandals rattling the Obama administration.

Former football star and actor OJ Simpson is testifying at a Nevada court hearing on his request for a new trial in an armed robbery case.

Convicts in Russia team up to play a chess tournament via Skype with inmates at the biggest jail in the US, Chicago's Cook County Jail.

Human cloning is used to produce early embryos, marking a "significant step" for medicine, say US scientists.

An abortion doctor convicted of killing three babies by cutting their spines after illegal late-term abortions receives three life prison sentences.

Scientists say 1.5-billion-year-old water drilled from rock in a North American mine is the most ancient yet found on Earth.

A rollercoaster which was destroyed by fierce 'super storm' Sandy, has now been removed from the New Jersey coast.

OJ Simpson is back in court trying to get his conviction quashed for armed robbery.

Ariel Castro's lawyers say their client, accused of imprisoning three women for about a decade in his Ohio house, will plead not guilty.

For the second time in as many weeks, a US serviceman in charge of preventing military sex assaults is accused of misconduct.

The US Navy successfully launched an unmanned drone from the deck of an aircraft carrier for the first time on Tuesday, in what officials called a breakthrough for robotic aviation.

Prince's US trip played to his strengths, says BBC's Peter Hunt

A US man trying to dribble a football from Seattle to Brazil in time for the 2014 World Cup dies days into his trip after being hit by a truck.