Scientists Discover World's Oldest Stone Tools

http://ecowatch.com/2015/09/08/world-oldest-stone-tools/?utm_source=EcoWatch+List&utm_campaign=0eab3e8529-Top_News_9_8_2015&utm_medium=email&utm_term=0_49c7d43dc9-0eab3e8529-85946369


"We often know more than we can tell .." MIchael Polanyi

"We 'always' know more than we can tell .." Arthur Lake