Using special dredging machines, scientists brought to the surface 100 flint artifacts made by Stone Age people between 15,000 and 8,000 years ago ... next to a series of long-vanished estuaries.

made out of flint. These tools were made a very, very long time ago. Over 10,000 years ago, in what we now call the Stone Age. And to show how long ago that is, I'm going to walk back in time.

This is a pristine flint blade made from chert of the Upper Chalk of the North Downs. I found this flint knife while running in a race. It was exposed by rain. I stopped to pick it up. It has the ...