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Host Michel Martin and editor Ammad Omar crack open the listener mailbox for backtalk. This week, they talk about a controversy surrounding the possible sale of fine art in Detroit to settle the city's debts.

Scientists are trying to figure out how chemicals in the air interact with each other to make people sick. So they're building an instrument — a "lung in a box" — that goes way beyond the usual chemical monitors.

New technology is changing the way cities are run, with cutting-edge urban innovations around the globe. Sprawling, chaotic Rio de Janeiro has built a state-of-the-art operations center as it gears up for two major events.

Community activists in New York are angry after MillerCoors placed a Puerto Rican flag on a commemorative beer can. The can was designed to promote the annual Puerto Rican Day parade.

For the annual Quiet Music Festival of Portland, which begins today, the goal is to celebrate calming sounds. The festival gained fame after the show Portlandia featured a Battle Of The Gentle Bands.

The coffee chain says it will enforce its no-smoking rule at its outdoor seating areas and within 25 feet of store entrances. So, no coffee and a smoke for those who enjoy them together. Have smoking bans gone too far or not far enough?

Nuon Chea, the No. 2 leader in the genocidal Cambodian regime, and head of state Khieu Samphan are on trial for genocide and crimes against humanity during the 1970s.

A young woman's question prompted an eloquent answer from the actor, who spoke of the abuse his mother suffered and the role men must play in stopping such cruelty. "Violence is never, ever a choice that a man should make," said Stewart.

Scientists in Siberia say they've extracted blood samples from the carcass of a 10,000-year-old woolly mammoth, leading to speculation that a clone of the extinct animal might someday walk the earth. But researchers say the find must be studied further to know its potential.

The firefighters may have been trapped when the roof of the Southern Inn collapsed about two hours after the five-alarm fire started. Officials say at least four firefighters were killed and five others were injured.