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A new exhibit at the Peabody Essex Museum in Salem, Mass., features a flock of 70 finches and an array of tuned and amplified guitars. As the flock fills the open room, the birds are free to land on the guitars, making music of their own as they move and jump off the instruments.

An aging tree's girth is good for the planet, scientists say, because it helps it suck more carbon dioxide out of the air. "It's as if, on your favorite sports team, you find out the star players are a bunch of 90-year-olds," one ecologist says.

The rare northern spotted owl species faces habitat loss and, now, intruding barred owls. A biologist, and the federal government, have made a difficult decision — killing one owl to ward off the extinction of another.

Lanny and Tracy Barnes competed on the U.S. Olympic team in 2006, and Lanny competed in 2010. This year, Tracy gave her spot on the team to Lanny, who was ill during the selection races and just missed qualifying. "The Olympics are about more than just competing," Tracy says.

Coverage of President Obama's speech about proposed changes for the National Security Agency continues with more of his comments, plus analysis.

Venezuela is running out of newsprint and newspapers are shutting down. Media outlets say that it's another form of harassment by a government that often doesn't like what independent media reports.

The U.S. has been stepping up efforts to encourage international tourism, which represents about 3 percent of the country's gross domestic product. The country's reputation abroad has suffered due to revelations about spying by the National Security Agency. But Brand USA, which is running a new ad campaign, hopes to encourage international tourists to visit the U.S. Host Arun Rath speaks with Michael Scaturro, who wrote about the new campaign for The Atlantic.

On Monday, the nuclear deal between six world powers and Iran officially kicks in. But this agreement is just a first step in a long negotiation process. NPR's Arun Rath talks to Karim Sadjadpour, senior associate at the Carnegie Endowment for International Peace, about what to expect from additional disarmament talks.

Some of the earliest science fiction imagined voyages to Mars. We now have the space-faring technology to make reaching the Red Planet possible. It would involve massive resources and many potential dangers, but some believe the rewards would be massive.