Making arrowheads, blades, and other stone tools was once a survival skill and is still a craft practiced by thousands of flintknappers around the world. In the United States, knappers gather at regional "knap-ins" to socialize, exchange ideas and material, buy and sell both equipment and knapped art, and make stone tools in the company of others. In between these gatherings, the knapping community stays connected through newsletters and the Internet...