Presumptive Democratic presidential nominee Hillary Clinton was in Springfield, Ill., Wednesday where she sought to use the symbolism of a historic landmark to draw parallels to a present-day America that is in need of repairing deepening racial and cultural divides.

The Old State Capitol — where Abraham Lincoln delivered his famous "A house divided" speech in 1858 warning against the ills of slavery and where Barack Obama launched his presidential bid in 2007 — served as the backdrop for Clinton as she spoke of how "America's long struggle with race is far from finished."

Episode 711: Hooked on Heroin

1 hour ago

When we meet the heroin dealer called Bone, he has just shot up. He has a lot to say anyway. He tells us about his career--it pretty much tracks the evolution of drug use in America these past ten years or so. He tells us about his rough past. And he tells us about how he died a week ago. He overdosed on his own supply and his friend took his body to the emergency room, then left.

New British Prime Minister Theresa May announced six members of her Cabinet Wednesday.

Amid a sweeping crackdown on dissent in Egypt, security forces have forcibly disappeared hundreds of people since the beginning of 2015, according to a new report from Amnesty International.

It's an "unprecedented spike," the group says, with an average of three or four people disappeared every day.

The Republican Party, as it prepares for its convention next week has checked off item No. 1 on its housekeeping list — drafting a party platform. The document reflects the conservative views of its authors, many of whom are party activists. So don't look for any concessions to changing views among the broader public on key social issues.

Many public figures who took to Twitter and Facebook following the murder of five police officers in Dallas have faced public blowback and, in some cases, found their employers less than forgiving about inflammatory and sometimes hateful online comments.

As Venezuela unravels — with shortages of food and medicine, as well as runaway inflation — President Nicolas Maduro is increasingly unpopular. But he's still holding onto power.

"The truth in Venezuela is there is real hunger. We are hungry," says a man who has invited me into his house in the northwestern city of Maracaibo, but doesn't want his name used for fear of reprisals by the government.

The wiry man paces angrily as he speaks. It wasn't always this way, he says, showing how loose his pants are now.

Ask a typical teenage girl about the latest slang and girl crushes and you might get answers like "spilling the tea" and Taylor Swift. But at the Girl Up Leadership Summit in Washington, D.C., the answers were "intersectional feminism" — the idea that there's no one-size-fits-all definition of feminism — and U.N. climate chief Christiana Figueres.

Copyright 2016 NPR. To see more, visit http://www.npr.org/.

Arizona Hispanics Poised To Swing State Blue

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Our Skin's Sense Of Time Helps Protect Against UV Damage

Oct 10, 2013

We all feel the biological master clock, ticking deep within our brains, that tells us when to sleep and when to wake.

Well, it turns out that our skin cells have a circadian rhythm of their own. Researchers have found that depending on the time of day, our skin's stem cells busy themselves with different types of tasks.

During the day, our epidermis works to defend itself against ultraviolet light from the sun. But at night, it focuses instead on regenerating cells that were damaged during the day. This built-in system helps protect us from premature ageing and skin cancer.

"The thing is, our skin is prepared to cope with the UV light at a certain time of day," says Guiomar Solanas, one of the researchers at the Center for Genomic Regulation in Barcelona responsible for the findings.

"If the circadian rhythms are somehow disrupted by disease, then our skin is much more vulnerable to the DNA damage caused by UV light," she tells Shots.

Travel, for example, can mess with our internal clocks. So when you jet across the world for a beach vacation, make sure you slather on the sunscreen. Since your skin can't adjust right away to the time difference. "Your skin won't be prepared to cope with the UV light, but you will still be receiving it," Solanas says.

The researchers figured all this out by collecting skin stem cells from healthy adults, culturing them in petri dishes and closely monitoring them during 24 hour cycles. The study, led by Salvador Benitah from Barcelona's Institute for Research in Biomedicine, is published in the journal Cell Stem Cell.

"It's very basic research, meaning that the application is quite far away," Solanas says. But, she says, since DNA damaged caused by UV light is a major cause of skin cancer, "the more we know how the healthy skin works, the more we can know about how disease starts and disease progresses."

The researchers looked at adult stem cells, in particular, because those are the cells responsible for repairing and regenerating damage. Previous experiments looked at circadian rhythms in mice, but this is the first time anyone has shown that human stem cells are regulated by an internal clock, the researchers say.

Solanas says the next step is to figure out how stem cells age. As we get older, our internal clocks are thrown out of whack—but we don't know how or why our skin loses its ability to defend against environmental damage.

The work was funded by grants from the European Research Council and the European Union.

Copyright 2013 NPR. To see more, visit http://www.npr.org/.