Stone tools worked by humans are all important. It's not easy to distinguish Neanderthal from ours, or anything like that, or modern from ancient, but it's vast

Stone tools worked by humans are all important. It's not easy to distinguish Neanderthal from ours, or anything like that, or modern from ancient, but it's vastly more likely you'll find an ancient stone tool than a modern version. Very few people are making them, and even fewer are leaving them out on the ground.