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Mona Lisa: Leonardo's Earlier Version - YouTube
http://www.youtube.com/watch?v=ISowhGz5wnk
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THOMAS EISNER: Seven Wonders of the World - YouTube
https://www.youtube.com/watch?v=Ai62iR3X6zE
Thomas Eisner (1929 - 2011) was a brilliant American entomologist, known as the "father of chemical ecology." A Professor at Cornell University, he was a wor...