Have you ever found a broken stone and wondered whether it was an ancient tool? Natural processes do interesting things to rocks, and some of them look similar to alterations made by people. Even so, chipped-stone tools show telltale signs of having been worked by human hands. In this video, Dr. Connie Arzigian looks at a variety of chipped-stone tools to see what identifies them as human made. Check the timestamps in the YouTube video description for quick reference to parts of the video.