| The history of the knife is an intriguing one dating hack to simple flint tools knapped by prehistoric man. |
| On the reverse, the knapped area is more limited and slightly flat and it is longer and more oblique on the front face. |
| Although they have surprisingly sharp cutting edges when freshly knapped, flake tools soon become dull. |
| As soon as you come near to the South Downs, you get into the chalk lands, and all the older buildings begin to have knapped flints in them. |
| Has our cognitive ability risen steadily since our forebears knapped the first stone tools? |
| Some flints were knapped so painstakingly that their outer surfaces were not only flat but also rectangular. |
