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Scientists have discovered that a mouse found in Africa can lose large patches of skin and then grow it back without scarring, perhaps as a way of escaping the clutches of a predator.

The finding challenges the conventional view that mammals have an extremely limited ability to replace injured body parts. There are lizards that can regrow lost tails, salamanders that can replace amputated legs, and fish that can generate new fins, but humans and other mammals generally patch up wounds with scar tissue.

Democrats in Florida think they have a chance in November to take back some congressional seats now held by Republicans. Near the top of the list is the 26th Congressional District near Miami.

It's a largely Hispanic district currently represented by Republican David Rivera. Although just a freshman in Congress, Rivera is a well-known Miami politician. Before being elected to Congress, he served eight years in the Florida Legislature and shared a house with longtime friend Marco Rubio.

About a dozen men prayed recently at Darkei Shalom, a Hasidic Jewish synagogue in the working-class neighborhood of Otradnoye in north Moscow.

Except for the Star of David on its squat tower, the building is as plain and utilitarian as the linoleum on the floor. It sits — along with a Russian Orthodox church and a mosque — on a leafy stretch of land surrounded by towering apartment blocks.

As states work to comply with the federal health care law, many are designing their insurance exchanges, where people will be able to shop for coverage.

But just the word "exchange" sounds to many like off-putting government-speak, and some states are eager to come up with a more appealing name for these new marketplaces.

Peter Lee directs California's Health Benefit Exchange. It's up for a new name, and Lee says they want it to sound fresh, dynamic and innovative.

It started as trash talk between two contributors to a national security blog. They decided to host a drone smackdown to see if one guy's machine could take down another.

Unarmed drones, of course. The kind you can put together with a toy-store model and $200 in modifications. But the game turned out to have some serious undertones.

First, a word about the location. For a moment last week, the whole drone smackdown was up in the air.

Football fans are furious. Bettors are out an estimated $150 million. Gov. Scott Walker of Wisconsin — the Republican who's famous for battling with organized labor — is on the side of the referees union. And the NFL is in something of a "prevent defense," saying that nothing can be done to change the outcome.

Scientists have known for a while that breast cancer is really four different diseases, with subtypes among them, an insight that has helped improve treatment for some women.

But experts haven't understood much about how these four types differ. A new report, published online in the journal Nature, provides a big leap in that understanding.

Transcript

MELISSA BLOCK, HOST:

So six weeks to go before Election Day, but in-person early voting has already started in a handful of states. Many others will begin soon, and more and more of us are choosing to vote early. In Colorado, for example, where we just heard from Ari Shapiro, nearly 80 percent of votes were cast early in the 2008 presidential election.

Michael McDonald tracks these trends with the U.S. Elections Project at George Mason University and he joins me now. Welcome to the program.

MICHAEL MCDONALD: Oh, thank you for having me.

Second of a two-part series

Last year, after the Atlanta rock band Black Lips released the album Arabia Mountain, its members planned a trip to tour the Middle East, but the wave of Arab Spring protests forced them to change plans. Yet even with simmering anti-Americanism persisting throughout the region, singer-guitarist Ian St. Pe was determined to see this through. Cairo, where I spoke with them on Friday, was the band's second stop.

Researchers have found the first drug to treat progeria, an extremely rare genetic disease that causes children to age so rapidly that many die in their teens.

The drug, called lonafarnib, is not a cure. But in a study published Monday of 28 children, it reversed changes in blood vessels that usually lead to heart attacks and strokes.

The income gap is receiving much attention lately as more Americans are isolating themselves around "people like us."

More accurately, they surround themselves with people who earn similar incomes, and it is now fueling a rise in residential segregation. One recent study suggests the income gap might be greater today than even during colonial times – even when you account for slavery.

Cities and towns facing tight budgets have often neglected their cemeteries, an oversight that has left many of them in disrepair with broken fencing, crumbling gravestones, overgrown grass and persistent weeds.

But this summer, the Vermont town of Charlotte implemented a new strategy to both save money and keep grass in the town's graveyards under control, and it's a decidedly traditional way of doing it: Let goats and sheep do the work.

Johns Hopkins, Yale, Harvard, Columbia and Cornell. What do these medical schools have in common?

Beyond their first-rate reputations, they're also on the short list of top U.S. med schools that don't have departments of family medicine. Elite schools have long focused on training specialists and researchers, but with the federal health law's emphasis on primary care, some schools are looking harder at family medicine.

Weekends on All Things Considered continues its "Why Music Matters" series with music from the heavens, as chosen by astronaut Stan Love.

"In space, every day is an important day of work," Love says. But when he was sent up to the space station to drop off and pick up crew members, the returning station crew member asked, "Dudes, where are the tunes?"

A reminder from weekends on All Things Considered guest host Jacki Lyden that Round 9 of Three-Minute Fiction is still open for submissions. Our judge, Brad Meltzer, is looking for an original short story that revolves around a U.S. president — fictional or real — in under 600 words. Listeners can submit their story online at www.npr.org/threeminutefiction. The deadline for submissions is Sunday, September 23, at 11:59 p.m. ET.