A memorial is held in Indonesia for the victims of the Indian Ocean tsunami - the first in a series of events marking the 10th anniversary of the disaster.
The Sony Pictures comedy The Interview opens in some US cinemas and online, after a major cyber-attack and threats over its release.
In 1968, the BBC filmed veterans from opposing armies who took part what became known as the Christmas Truce.
Count wild penguins, and help science discover more about their lives
Driving the Mirai, a car that emits only water
Think you’re a geography expert? Test your knowledge with BBC Travel’s Geoguessr – the game that proves how well you know the world.
A handful of girls seem to defy one of the biggest certainties in life: ageing. Virginia Hughes reports on the families wrestling with a condition they can’t explain.
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