Former Haitian President Jean Claude "Baby Doc" Duvalier makes a surprise return to Haiti, 25 years after he was overthrown by a popular revolt.

Maria Sharapova wins on the opening day of the Australian Open in Melbourne, with Caroline Wozniacki and Roger Federer in action later.

The climate secrets of the ocean's deepest spot - the Marianas Trench in the western Pacific Ocean - begin to be unlocked by scientists.

The UK government should put a moratorium on shale gas operations until the environmental implications are fully understood, a report says.

The upheaval in the NHS in England is unnecessary as the same results could have been achieved by small changes, leading GPs say.

The Bank of England should "hold its nerve" and avoid pressure to raise interest rates, an influential economics forecaster says.

A government minister needs to be tasked with tackling the issue of sexual exploitation of children, a leading children's charity says.

David Cameron is to set out his determination to modernise public services, saying he wants reform to be a legacy of his government.