Alex Gibney is the director of the Academy Award winning documentary "Taxi to the Dark Side."
Intelligent. Optimistic. Curious.
Audio
Andrew Wojtanik triumphed at the National Geographic World Geography Bee in 2005. His study guide has become "Afghanistan to Zimbabwe."
Al Franken and Katherine Lanpher present "The Audio Crawl."
Kim Stanley Robinson is renowned for his futuristic science fiction, so he surprised lots of people by writing a novel set in the Paleolithic era. He says recent archeological discoveries, as well as his backpacking in the Sierra Nevada, inspired him to write about our ancient ancestors.
Getting a good night's sleep is hard for a lot of people, but imagine trying to drift off when you have terrifying hallucinations. Filmmaker Rodney Ascher documents the unsettling world of sleep paralysis - a strange condition where you can't move or speak and often have visions of demonic "shadow men."
Do you think your memory is like a video camera, storing every experience you've ever had? Historian Alison Winter says we tend to use technology metaphors to think about memory.
What would it be like to spend two days a month in complete silence?
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