Cache of oldest bone tools reveals craftsmanship of early human ancestors

A cache of 1.5 million-year-old bone tools uncovered in Tanzania suggest ancient human ancestors were capable of critical thinking and advanced craftsmanship.

​ A cache of 1.5 million-year-old bone tools uncovered in Tanzania suggest ancient human ancestors were capable of critical thinking and advanced craftsmanship. Read More Breaking News, Latest News and Videos | CNN