File photo of an archaeological site near the Lake Turkana area in Kenya. The world's earliest known tools may have been found in the region. (AP Photo/Nature, Rhonda L. Quinn)
Archaeologists may have just rewritten the book on the first use of tools in a major way. The team found what it says are unmistakable stone tools at a site near Lake Turkana in Kenya that date back 3.3 million years, reports Science.