Early Humans Used Heat-Treated Stone for Tools

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	Early Humans Used Heat-Treated Stone for Tools

thisnamecantbetaken

8-14-2009 7:40 AM

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8-14-2009 1:14 PM

The Infowarrior

Flint knapping is actually a very handy skill to have and one that takes huge amounts of practice and paitience.

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<div style="margin: 12px 0px; font-family: arial; color: #333333; background: #ffffff; border: solid 4px #e5e5e5; width: 100%; clear: left;"><div class="CM_CTB_Content_Wrap" style="margin: 0px; padding: 0px;background-color: #ffffff;"><div style="border-bottom: solid 1px #dcdcdc; white-space: nowrap; margin-bottom: 8px; background-color: #eeeeee ;background-image: url(http://clipmarks.com/images/source-bg.gif); background-repeat: repeat-x; height: 24px; line-height: 24px; vertical-align: middle; padding-bottom: 4px; color: #666666; font-size: 10px;" ><a href="http://clipmarks.com/clip-to-blog/" title="see clips that are hot right now"><img src="http://content.clipmarks.com/blog_embed/d599a887-e0ce-4c7e-9d64-23af740d0167/8C5739E0-0128-47B2-8A3D-31823A4DB6BB/" alt="" width="19" height="19" border="0" style="vertical-align: middle; margin: 0px 4px; display: inline; border: none; float:none;" /></a>clipped from <a title="http://www.nytimes.com/2009/08/18/science/18obfire.html?ref=science#" href="http://www.nytimes.com/2009/08/18/science/18obfire.html?ref=science#" style="font-size: 11px;">www.nytimes.com</a></div><blockquote style="text-align: left; padding: 0px 8px; margin: 4px 0px 8px 0px; background: transparent; border: none;" cite="http://www.nytimes.com/2009/08/18/science/18obfire.html?ref=science#"><NYT_HEADLINE type=" " version="1.0">
Early Humans Used Heat-Treated Stone for Tools
</NYT_HEADLINE></blockquote><div style="height: 2px; font-size: 2px; background: #dcdcdc; border-bottom: solid 1px #f5f5f5; margin: 2px 4px;"></div><blockquote style="text-align: left; padding: 0px 8px; margin: 4px 0px 8px 0px; background: transparent; border: none;" cite="http://www.nytimes.com/2009/08/18/science/18obfire.html?ref=science#"><P>Tool manufacturers know that sometimes you have to heat-treat a material to make it harder or stronger.</P></blockquote><div style="height: 2px; font-size: 2px; background: #dcdcdc; border-bottom: solid 1px #f5f5f5; margin: 2px 4px;"></div><blockquote style="text-align: left; padding: 0px 8px; margin: 4px 0px 8px 0px; background: transparent; border: none;" cite="http://www.nytimes.com/2009/08/18/science/18obfire.html?ref=science#">Ancient toolmakers learned that trick, too. And archaeological research from South Africa pushes back the date of the earliest use of heat treatment at least 45,000 years, to more than 70,000 years ago.</blockquote><div style="height: 2px; font-size: 2px; background: #dcdcdc; border-bottom: solid 1px #f5f5f5; margin: 2px 4px;"></div><blockquote style="text-align: left; padding: 0px 8px; margin: 4px 0px 8px 0px; background: transparent; border: none;" cite="http://www.nytimes.com/2009/08/18/science/18obfire.html?ref=science#"><P> Kyle S. Brown, a doctoral student at the University of Cape Town, and colleagues report finding stone tools that show signs of being heated to about 600 degrees Fahrenheit. Heat-treating in this way, most likely by burying under a fire, made the stone easier to knap, or shape into a tool by striking with another stone.</P></blockquote><div style="height: 2px; font-size: 2px; background: #dcdcdc; border-bottom: solid 1px #f5f5f5; margin: 2px 4px;"></div><blockquote style="text-align: left; padding: 0px 8px; margin: 4px 0px 8px 0px; background: transparent; border: none;" cite="http://www.nytimes.com/2009/08/18/science/18obfire.html?ref=science#">the consensus among archaeologists had been that systematic heat treatment first occurred in Europe about 25,000 years ago. The current work, he added, “is almost indisputable evidence” for heat treatment 72,000 years ago, and perhaps as early as 164,000 years ago</blockquote></div><div style="margin: 0px 6px 6px 4px;"><table style="font-size: 11px;border-spacing: 0px;padding: 0px;" cellpadding="0" cellspacing="0" width="100%"><tr><td style="background:transparent;border-width:0px;padding:0px;">&nbsp;</td><td align="right" style="background:transparent;border-width:0px;padding:0px;width:107px" width="107"><a href="http://clipmarks.com/share/8C5739E0-0128-47B2-8A3D-31823A4DB6BB/blog/" title="blog or email this clip"><img src="http://content8.clipmarks.com/images/c2b-foot.png" border="0" alt="blog it" width="107" height="17" style="border-width:0px;padding:0px;margin:0px;" /></a></td></tr></table></div></div>

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