Flint knapping is an old English term given to the workers who created gun flints. It now applies to individuals who work flint into tools such as arrowheads. The actual art of working flint has been around for possible a million years. Most of the best work being done within the last 20 thousand years. It is one of the first industries created by man. It is also one of the first hazardous industries, with the dust causing silicosis of the lungs. Hence it is best to do flint knapping outside to allow the dust to dissipate.