Scientists have created a lie detector that records the involuntarily, guilty fidgeting of liars.
The "war on terror" has failed to eliminate or reduce terrorism despite trillions being spent on wars in Iraq, Afghanistan and operations elsewhere.
The NSA shares intelligence data with Israel without first sifting it to remove information about US citizens, states a document from Edward Snowden.
Edward Snowden has gone into hiding in Hong Kong after blowing the whistle on a top-secret US spying programme.
Republicans feel snubbed by the US president's combative inauguration speech. Ewen MacAskill reports.
United States President Barack Obama has mounted the biggest challenge in two decades to the US's deeply ingrained gun culture.
Republican senators have opened the way for a new showdown with United States President Barack Obama.
Mitt Romney has raised Republican hopes of an election comeback with a spirited and aggressive performance in the first televised presidential debate.
Mitt Romney's battered presidential bid has been hit by a secretly recorded video in which he sets out views on the Israel-Palestine issue.
The United States has vowed to avenge the consulate attack that killed its ambassador and would work alongside the Libyan government.