Fred Rowe,
Thanks for that pic, that's quite a nice collection you've got there. Is the obsidian from Ohio, I didn't realize that it existed there if it is. I'm no expert, but I do work for a crm firm and have found a number of stone and bone tools during the last few months. Just from looking at them I can assure you there was nothing necessiarily instinctual about them. A lot of them took a lot of forethought and design to manufacture. A good friend at work does a lot of lithic reproduction/lithic analysis and he confirms that although it's simple once you learn it, it definately takes a lot of thought. You have to know the fracture characteristics of the material, and some of the basic physics. One of my favorite quotes from my father is "Primitive doesn't mean 'stupid'". Also, just as an aside, I believe scientists now say that we're the only ones that "habitually" make and use tools, due to the chips using sticks. They have also observed chimps banding together to hunt small monkeys using stones. IIRC they are Dark Forest chimps, I don't recall where.
Sorry for the longwinded post.
Lagarto.