Knapping - Cutting-edge technology

A SON-IN-LAW of mine, living in the UK, has recently made a hobby of knapping.

That’s spelt with a ‘k’ and has nothing to do with taking 40 winks.

He makes beautiful (and potentially lethal) arrowheads, and fixes them to shafts of ash or hazel with sinew or string. The earliest examples of stone tool-making come from the Olduvai Gorge, where hominids fashioned stones into sharp chopping tools 2.6 million years ago.