Researchers have moved a step closer to creating a synthetic liver, after a US team printed a 3D model of a network blood vessels could grow into.

A proposal to declare almost all of the southern Atlantic Ocean a whale sanctuary is defeated at the International Whaling Commission's annual meeting.

UN human rights chief Navi Pillay says "further militarisation" of the crisis in Syria by other countries must be avoided "at all costs".

A US court rules that Twitter must hand over tweets posted by an Occupy Wall Street protester facing trial for disorderly conduct.

A protest by Guatemalan students opposing changes to university courses turns violent with two government ministers and dozens of police and students injured.

High-level talks at the United Nations aimed at creating a treaty to regulate the global arms trade stall on their first day over a technicality.

Microsoft takes a $6.2bn write-down on the value of online advertising agency aQuantive, bought five years ago for $6.3bn.

The Waldo Canyon fire, the most destructive wildfire in Colorado's history, is now 70% contained, officials say, as fires rage across the western US.