Vesta shows new type of weathering

The highly-patterned surface of the giant asteroid Vesta is caused by a long history of strikes from hundreds of other, smaller asteroids.

Humans helped wipe out African rainforest

The widespread disappearance of rainforest in central Africa 3,000 years ago may have been caused by human activity.

Arrival of plants triggered ice ages

The arrival of the first plants 470 million years ago triggered a series of ice ages.