LIFE ON THE EDGE: SURVIVING EARTH'S GREATEST EXTINCTIONS

Sixty-six million years ago, the sky fell. A 10km asteroid struck the Yucatan. Energy one million times greater than any human weapon. Oceans rose in gigantic tsunamis. Forests burned in global fires. Dust covered the sky. A winter that lasted for years. Three-quarters of all species vanished. The dinosaurs were gone. This was the most famous extinction. But it was not the worst.