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Ultraviolet light can burn your skin and raise the risk for skin cancer. New research has helped uncover how the rays can weaken skin's outer layer, compromising its ability to protect the body.

From Earth, lifeless Mars can seem like a serene and boring planet. However, scientists noticed some little black dots in a satellite image of the Martian sand that may hint at an exciting, explosive geography.

The city is divided after months of fighting. In the latest attack, dozens were killed in suicide bombings that appear to be the work of rebels.

For the first time, two female Marines are among those training to see if they have what it takes to be battlefield leaders. They're part of a test to see if women can lead Marines in ground combat — jobs that are closed to them now. The training is so difficult that about 20 percent of participants fail.

The American owner of Hamptons Cupcakes has some beefs with the bureaucracy, but lots of optimism about the country in which she chose to develop her business. She recently opened her third bakery.

A Syrian shell killed five people in a Turkish village Wednesday, and Turkey responded with an artillery attack. Turkey also asked NATO and the U.N. for support. To put these events into context, Renee Montagne talks to Hugh Pope, a Turkey expert with the International Crisis Group.

The MTV reality show begins its sixth and final season Thursday night. The shows producers say they wanted to go out on a high, and the ratings still are. Jersey Shore debuted in 2009. It followed eight cast members living and partying together in Seaside Heights, N.J.

Turkey continued to retaliate for a Syrian mortar attack that killed five civilians.

That means that one in seven people in the world access Facebook on a monthly basis.

The two are having very different mornings. Lehrer swallowed scathing reviews and Big Bird enjoyed a strong backing.