Come see the newest exhibit opening Oct. 9, at 10 a.m. at the CU Museum of Natural History. The discovery of stone tools from the late Pleistocene within the city limits of Boulder is a rare event in archaeology. This new exhibit features a collection of 80+ stone tools known as the Mahaffy Cache that was found in a Boulder backyard in 2008. The exhibit includes interactive elements and video, as well as replicas of the tools that visitors can pick up and hold.