We went to the Cahokia Mounds museum, today, for their "Archeology Day." They had extra people there doing special exhibits and activities. Mitchell particularly enjoyed trying to make an arrowhead from chert, which we were told was the most common stone in this area that was suitable for flintknapping. When it is dark or black, it is considered "flint." Working it into tools is a craft known as "flintknapping."
By the time he was done, he was giving instruction on the topic...