Talk of the Nation on KAZU

Traffic cameras that snap pictures of cars running red lights or speeding are used in 661 cities around the U.S. NPR's Corey Dade explains that while local governments argue they make driving safer, some motorists believe the cameras are nothing more than revenue generators.

Journalist Marie Colvin, of Britain's Sunday Times, was killed in Syria Wednesday — along with French photographer Remi Ochlik. NPR's Neal Conan remembers the foreign journalist who joined Talk of the Nation several times, reporting from Gaza and Libya.

Some analysts are calling the GOP primary in Michigan a do-or-die state for Mitt Romney, who grew up in the suburbs of Detroit and whose father was a popular governor in the state. NPR's Ken Rudin and NPR's Don Gonyea discuss the Michigan primary.

Wikipedia is the go-to source for succinct information on almost every topic imaginable. It strives to reflect neutral truths that can be verified by reliable sources. The site, known as "The Free Encyclopedia" is written and edited by volunteers.

In the documentary If A Tree Falls, director Marshall Curry tells the story of the rise and fall of the Earth Liberation Front, a group that the FBI once described as America's number one domestic terrorism threat. The film has been nominated for an Academy Award.