Rodney Long wrote:

The first tools man made were spear points, and knives to kill, and
"butcher" meat, and each other.

'The way chimpanzees in West Africa use stone tools to crack
open nuts for food and pass on the trick to their offspring has
been revealed in an intriguing study published in the journal
Science.
...
During their expedition to the Tai Forest last year, the scientists
recovered 479 stone pieces, chips of granite, laterite, feldspar
and quartz broken from the hammers.

Another lead researcher, Dr Julio Mercader, also from George
Washington University, said the study could help us better
understand the behaviour of human-like species from several
million years ago.

"We do not say that [old hominid] sites look like our chimp
sites. What we do say is some of the flakes we found in some
of the pieces of shatter resemble those found at some of the
technologically simplest [hominid] sites in East Africa," he said.

"The implication is that older hominids practised nut-cracking
like the chimps."
...'
http://news.bbc.co.uk/1/hi/sci/tech/2006309.stm