Aug 11, 2010 1:03 PM by Melissa Canone
NEW YORK (AP) - Scientists say they've found the earliest
evidence for the use of stone tools by a human ancestor.
They report in the journal Nature that two ancient animal bones
from Ethiopia show signs of being butchered and smashed by stone
tools about 3.4 million years ago. That's about 800,000 years
earlier than the previous earliest evidence for tool use.
The researchers say the tools were used by the species best
known from the skeleton known as "Lucy." No tools were found with
the bones, and it's not clear whether our ancestors made the tools
or simply used stones that they found.
Not all experts are convinced by the research. Some said they
weren't sure the markings on the animal bones really came from