Glog

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http://en.wikipedia.org/wiki/Leonardo_da_Vinci

http://www.mos.org/leonardo/bio.html

http://answers.yahoo.com/question/index?qid=20080520102004AAeWVaR

http://library.thinkquest.org/13681/data/links/math.htm

http://www.timelineindex.com/content/view/648m

http://www.thequoteblog.com/wp-content/uploads/2007/07/leonardo-da-vinci.JPG

http://www.duoc.cl/info2/info260405/imag/leonardodavinci.jpg