The US space agency, Nasa, suspends the March launch of its next mission to Mars because of fault in a key research instrument.

Dogs can copy each other's expressions in a split-second just like humans, showing the ability to 'read emotions', according to Italian researchers.

A Russian cargo vehicle carrying food and supplies has docked with the International Space Station - just in time for Christmas.

Ecologists use tiny tail-mounted cameras to observe wild New Caledonian crows making and using hook-shaped tools.