All Things Considered

When Duan Biggs was growing up in the Kruger National Park in South Africa, he used to watch elephants and rhinos walking past his bedroom window. He left home to pursue degrees in biology and economics, and when he returned in 2011 the park looked and sounded "like a pseudo war zone," he says.

"There'd be helicopters flying overhead all the time," he says. "I remember one afternoon coming back to my home from a game drive and the bush was crawling with people with assault rifles, from the army, from the police, and from National Parks. They were looking for poachers."

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AUDIE CORNISH, HOST:

It's been one month since a pair of bombs exploded near the finish line of the Boston Marathon, killing three and wounding more than 260. NPR's Joel Rose returned to the scene today and found Bostonians observing the somber occasion with little fanfare.

Climate change is gradually altering the fish that end up on ice in seafood counters around the world, according to a new study.

"The composition of the [global] fish catch includes more and more fish from the warmer areas, and cold-water fish are getting more rare, because the temperatures are increasing," says Daniel Pauly at the University of British Columbia, a co-author of the study.

Scientists say they have, for the first time, cloned human embryos capable of producing embryonic stem cells.

The accomplishment is a long-sought step toward harnessing the potential power of embryonic stem cells to treat many human diseases. But the work also raises a host of ethical concerns.

Audie Cornish talks to Scott Horsley about the IRS Inspector General's report on the agency's audit of conservative groups.

A serial killer who committed suicide in an Alaska jail last year confessed to murdering at least 11 people across the country. But Israel Keyes didn't name names, and investigators trying to figure out who he killed are running into a major stumbling block: There is no unified, mandatory national database for missing persons.

Nearly 700 presidential hopefuls have thrown their names into the ring for Iran's June 14 presidential elections. But two last-minute entrants have altered the shape of the already-chaotic race: a former president once dismissed as a has-been and Iran's chief nuclear negotiator.

The University of Memphis baseball team plays its final home game of the season Tuesday. In addition to rooting for the players, Memphis fans will cheer for someone else: batboy Stan Bronson Jr.

If it's a Monday, you can usually find Dr. David Brown parked next to a lake in Miami, spending the day inside a 36-foot-long RV. He's not on vacation.

Brown is chief of family medicine at Florida International University's medical school. The RV is the school's mobile health clinic.

The webpage Google.ps used to read "Google: Palestinian Territories." On May 1, the company quietly changed that regional search page to say "Google: Palestine."

Google didn't announce the name change, but it didn't have to. In a place where small gestures can carry great symbolism, Palestinians noticed right away.

"Everybody knows about it and they screenshot [and] post on Facebook: 'Yay Google, thank you,' " says Mohammad Kumboz, a 22-year-old graphic designer and computer programmer who lives in the Gaza Strip.

After living underground in the United States — figuratively speaking — some undocumented immigrants deported to the Mexican border city of Tijuana are living in holes. These migrants have dug bunkers along Tijuana's sewage canal to protect themselves from police who routinely burn down their makeshift homes.

Over the past decade, some 39,000 people have come forward voluntarily to tell the IRS about offshore money they haven't been paying taxes on. This group provides a small window into the world of people who are hiding money in offshore havens. (It's a world we've been trying to learn more about, partly by setting up an offshore company in Belize.)

It says a lot about the state of the war against poachers in Africa that the Lewa Conservancy, a private sanctuary in Kenya with 12 percent of the country's rhinos, recently appointed a CEO who has never studied zoology or biology. Instead, Mike Watson is an ex-captain in the British army.

His training has already come in handy. Take, for instance, a visit to a crime scene earlier this year: a rhino carcass splayed out in the mud.