This May 24, 1961, photo provided by the Mississippi Department of Archives and History shows the booking photos of civil rights activist James Farmer, who was arrested — along with many others — during the Freedom Rides. AP hide caption

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President Obama delivers his address on Libya at the National Defense University in Washington on March 28, 2011. Manuel Balce Ceneta/AP hide caption

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Bernie Madoff leaving U.S. District Court in Manhattan after a bail hearing in New York, Monday, Jan. 5, 2009. The former executive chairman of NASDAQ was sentenced to 150 years in prison in 2009 for his role in a massive Ponzi scheme. Kathy Willens/AP Photo hide caption

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Hazel Dickens onstage at 2008's Hardly Strictly Bluegrass Festival in San Francisco. Anthony Pidgeon/Redferns hide caption

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Bat bugs typically feed on bats. But when no bats are available, these parasitic creatures will happily feed on humans, too. Graham Snodgrass/AFPMB/Flickr hide caption

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Emery Brown is a professor of computational neuroscience and health sciences and technology, with a joint appointment at MIT and Harvard University. He is also a professor of anesthesia at Harvard Medical School. MIT hide caption

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A brain tumor is highlighted in blue on this MRI taken of the human brain. There were 43,800 new cases of brain tumors in the United States in 2005. National Cancer Institute hide caption

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Author Interviews

An Oncologist's Pulitzer-Winning Cancer Biography

Oncologist Siddhartha Mukherjee chronicles how our understanding of cancer has evolved in his new book The Emperor of All Maladies: A Biography of Cancer.

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In the late 1990s, both Marinovich and Silva traveled to the Middle East to photograph the ongoing clashes in the region. Silva captured this image of a young Palestinian boy throwing a tire in the West Bank town of A-Ram in March 1997. Joao Silva/AP hide caption

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Herzog was only permitted to enter the caves for one week of filming. Mark Valesella/IFC Films hide caption

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