Billions of years ago, water flowed on the surface of Mars. But scientists have an incomplete picture of how the red planet's ...

Pupils could take notes on an illustration of the water cycle - showing what happens at each stage - and then discuss what they think would happen if one phase ... how climate change might impact ...

No, hang on, not that kind of cycle. And what's that you got there? A shrink ray! Right, go on, into the sea with you. So the sun heats up water in the sea, river and lakes, and turns it into ...