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Once the smoke cleared in the casinos of Gilpin County, Colo., after an indoor smoking ban took effect, health researchers documented a sharp drop in the number of emergencies requiring ambulances.

It's being called a destroyer, or perhaps a helicopter carrier. But by any name, Japan launched a new warship Tuesday that is its largest since World War II. The ship was shown to the public on the anniversary of the 1945 atomic bombing of Hiroshima, and at a time of rising tension with China.

Despite filing for bankruptcy, Detroit is still on track to get a $450 million hockey arena - partially funded with public money. Host Michel Martin speaks with sportswriter Dave Zirin, who calls the move 'shameless,' and David Muller, a business reporter for the MLive Media Group in Michigan.

What are the implications of a businessman like Amazon CEO Jeff Bezos owning a major media outlet? Melissa Block talks to Merrill Brown, director of the School of Communication and Media at Montclair State University in New Jersey.

CNN and NBC report the U.S. has charged the leader of a Libyan militia. The charges — the first in connection with the Sept. 11, 2012 attacks — were filed under seal in a New York court.

The federal government's top climate scientists announced Tuesday that 2012 was really hot — among the top 10 hottest years on record and the hottest ever in the U.S., with rising sea levels, less Arctic sea ice and warmer oceans. And the American Geophysical Union called humanity "the major influence" on global climate change.

Chinese scientists offer the first clear evidence that the H7N9 bird flu virus can be transmitted from human to human. A father, who became sick in March, passed the virus to his daughter. But the risk of transmission is quite low, and the virus still doesn't appear to pose a global threat.

The federal immigration checkpoint in Hudspeth County rounds up a lot more illegal drugs than undocumented immigrants. The feds used to help the county prosecute the low-level drug cases, but that money is drying up and the county is going to stop bringing minor cases to court, much to the sheriff's displeasure.

President Obama on Tuesday defended the U.S. government's surveillance program, telling NBC's Jay Leno that any tracking of phone numbers or email domestically was "connected to a terrorist attack."

Will the local gallery go the way of the local bookstore or record store? In the past few years, there's been a growth in sites that sell fine art on the Internet. On Tuesday, Amazon joined that market.