Historian Donald Sassoon tells Jim Fleming that the Mona Lisa is a great painting, but that other factors conspired to make it an international icon.
Intelligent. Optimistic. Curious.
Audio
Dan Lamoureux is a self-described dork who produced and directed the documentary film "Nerdcore for Life."
Charles Dwyer on art with his homeless neighbor - Jerry Pfeil.
David Greenberger transforms the words of elderly people in his series of "Duplex Planet" zines, comic books, spoken-word performances and radio plays.
Edmund Morris says Theodore Roosevelt was a force of nature - man of towering intellect, boundless physical energy and firm convictions whose greatest achievement as President was his commitment to conservation.
Emily Rapp had her foot amputated when she was 4, and the rest of the leg at age 8.
Daniel Dennett is one of the leading advocates of evolutionary theory and a fierce critic of creationism.
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