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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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.
Carl Honore speaks about the cultural revolution that is the "philosophy of slow."
In his book "Back to Our Future" David Sirota says the proof is in the staying power of 80s pop culture.
Franz Lidz is the author of "Ghosty Men: The Strange but True Story of the Collyer Brothers, New York's Greatest Hoarders."
Charles Monroe-Kane reports on Brian Dunn, who “finds” other people’s photographs and then keeps them. Some of the found photos are on our Web site.
DEVO co-founder Mark Mothersbaugh talks about his new visual art exhibition, "Myopia."
Contemplating the multiverse is mind-blowing, but if you want a truly earth-shattering controversy in physics, you have to go back 500 years to Copernicus' radical theory. Dava Sobel tells his story.
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