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Writer Sarah Hepola once got so drunk before giving a presentation to 300 people that she didn't remember it the next day. In Blackout, her memoir, Hepola wrestles with her reasons for drinking.

A group of Ugandan chimps has found a great way to boost their mineral intake and neutralize bitter compounds in their diet: by eating clay.

The U.S. Fish and Wildlife Service says it is investigating Minnesota dentist Walter Palmer, but the agency says it has failed so far to track him down.

Ai says he was denied a six-month visa because U.K. officials said he didn't list a criminal conviction in his application. Ai was imprisoned in China, but he notes he was never charged with a crime.

Automakers and researchers are using a 32-acre fake city at the University of Michigan to simulate a real-world environment for autonomous vehicles. How will such cars affect urban planning?

A study finds text-walkers go 25 percent slower than the flow and high step over curbs. Researchers call it "adopting a protective gait pattern."

The killing of Cecil the lion in Zimbabwe has highlighted big game hunting. Hunters legally kill more than 600 African lions every year. More than half the tourists hunting in Africa are American.

With a total program cost estimated at $400 billion and a per-plane price tag of $135 million, the Joint Strike Fighter program is considered the most expensive in U.S. history.

The treatments are popular in India and the United States, but some can be contaminated with high levels of lead and other toxic metals. People continue to be harmed.

As host of The Daily Show on Comedy Central, Jon Stewart is a funny man with a serious message. Originally broadcast July 22, 2005.