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.
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Dan Lamoureux is a self-described dork who produced and directed the documentary film "Nerdcore for Life."
In his book "Back to Our Future" David Sirota says the proof is in the staying power of 80s pop culture.
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.
Daniel Dennett is one of the leading advocates of evolutionary theory and a fierce critic of creationism.
DEVO co-founder Mark Mothersbaugh talks about his new visual art exhibition, "Myopia."
Chuck Klosterman tells Steve Paulson that interviewing celebrities is a tricky business because there really isn't any up side in it for the star.
The marriage of David and Kristen Finch was falling apart when Kristen asked Dave to take the "Aspie quiz." It turns out Dave has Asperger Syndrome. They talk about how the diagnosis changed their lives.
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