Posted on 05/12/2009 5:05:01 AM PDT by decimon
Stone Age humans were adept chemists who whipped up a sophisticated kind of natural glue, a new study says.
They knowingly tweaked the chemical and physical properties of an iron-containing pigment known as red ochre with the gum of acacia trees to create adhesives for their shafted tools.
(Excerpt) Read more at news.nationalgeographic.com ...
Tools with handles even more ancient
Science News | Friday, December 12th, 2008 | Bruce Bower
Posted on 12/15/2008 7:43:39 PM PST by SunkenCiv
http://www.freerepublic.com/focus/chat/2149393/posts
Civilization has been GREAT, but it has NOT provided an abundance of free time.
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