Two oldies but goodies http://www.ted.com/talks/tom_wujec_demos_the_13th_century_astrolabe http://www.ted.com/talks/tom_wujec_demos_the_13th_century_as... htt

Two oldies but goodies http://www.ted.com/talks/tom_wujec_demos_the_13th_century_astrolabe http://www.ted.com/talks/tom_wujec_demos_the_13th_century_as... http://www.ted.com/talks/joshua_klein_on_the_intelligence_of_crows http://www.ted.com/talks/joshua_klein_on_the_intelligence_of... found here : http://mayageddon.tripod.com/TED_Talks.html http://mayageddon.tripod.com/TED_Talks.html