Any existing physical object that is in some way fashioned or altered by humans and employed for a specific task or purpose. Tools made of stone included of axes, adzes, arrowheads, spearheads, daggers, knife blades, scrapers, borers, burins, picks, etc. The first tools date back to c 2,600,000 years ago, the beginning of the Paleolithic Age, and are different-sized pebble tools called choppers. The chopper was the only tool used by man for almost 2,000,000 years, until the appearance of the hand ax, a superior (and sharper) version of the chopper.