Nasa and Esa sign a letter of intent that could lead to the first "round trip" to the Red Planet.
The largest ever survey of western lowland gorillas shows most are living in unprotected areas.
Europe's latest Earth observation satellite will focus on the behaviour and health of oceans.
The customised robot is part of a study looking at how technology can help those in rural areas.
More than 40 firms including Coca-Cola have promised to reduce harmful packaging.
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