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A tell-all from Osama bin 'Laden's former mistress, more Green Screen Challenge and novelist Janna Levin in the studio tonight.
Stephen stumps Janna Levin -- a theoretical physicist -- by asking her the hardest question in the world.
Baby Janna's father arrested for murder
Still no sign of 3-month-old Janna Rivera
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TVGuide.com editors break down theories about what's coming up on The Walking Dead