A warning that all countries need to be clear of Ebola before the danger is over.
70% more food production will be required to feed the growing global population.
When did humans become a geological force? Europe’s invasion of the Americas in 1500s?
The sunlight-powered plane, Solar Impulse 2, is about to fly around the world.
The CLEVER project that aims to curb mobile phone waste
Claudia Hammond looks back at the Ebola epidemic to see why it spiralled out of control.