The future cities that could save the planet
Can cities really fight climate change? Around the world, new neighbourhoods are being designed where you can get all you need within a 15-minute walk. They could help reduce emissions.
Robot reveals secrets of the coral reef
Is exploring the ocean more important than going to space? New photos taken by a machine deep underwater have given scientists clues about life on the seabed – and how to protect it.
Oxygen on Mars paves the way for human trips
Do humans have a right to move to Mars? A NASA rover has extracted oxygen from the air on Mars. It could make moving to the red planet much easier. But should we be going there at all?