Life on Mars?

Nasa has obtained the clearest evidence yet that water flows on Mars, raising the possibility that the planet could be home to primitive life. Face-to-face talks between President Obama and the Russian leader Vladimir Putin have failed to resolve deep differences on how to tackle the conflict in Syria.

Hundreds of prisoners are on the loose in the Central African Republic after breaking out during an upsurge in violence between Christians and Muslims in the capital, Bangui.

(Photo: Computer-generated images of Mars captured by the Mars Reconnaissance Orbiter; Credit: Nasa)