I have been working at flintknapping for the last couple weeks. It is pretty challenging, and not as hard as it seems it could be. I have a few things to figure out, and I will be able to teach this a whole lot better. Sorry for the lack of posts over the last couple years, lots of things going on to take up my time. Back to blogging here and there. The science behind all of this knapping technology would encompass geology of the area, knowing where to get the best rock available for this type of work (making arrowheads), and then the break characteristics of the stone itself. Physics, i guess, in the way silica based rock breaks in a conchoidal (looks like a shell) fracture. I will put up some pics of my notcher/pressure flaker and the billets i have made. Some copied, but all made by myself.