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DNA's instructions are written in a code of four molecular "letters," labeled A, C, T and G. For the first time, researchers have created and inserted two brand-new letters into a living cell.

Neurosurgeon Monica Wehby, who's running for U.S. Senate in Oregon, has captured the imagination of the Republican establishment. But social conservatives are critical of her position on abortion.

Middle East peace talks have been officially paused; unofficially, many say they're finished. Jeffrey Goldberg of Bloomberg View and The Atlantic explains how Secretary of State John Kerry's mission fell apart.

The Department of Education has released its latest math and reading scores for 12th graders. The scores offer little good news for educators, with results low and largely unchanged since 2009.

Russian President Vladimir Putin says he is pulling his forces back from Ukraine's border. He also is calling on separatists in eastern Ukraine to postpone a referendum planned for Sunday. This news might be a breakthrough — or just a head fake.

When the SS Central America sunk in 1857, it took down tons of gold with it. Gary Kinder, author of Ship of Gold in the Deep Blue Sea, tells the fraught tale of shipwreck and recovered treasure.

Syrian rebels have surrendered Homs, the city known as the birthplace of the uprising against Syrian President Bashar Assad. It marks the end of a long siege and a huge blow to the rebels.

Like her own mother was, Desiree Metcalf is a young, single mom living in poverty. She doesn't have just one or two problems, but a whole pile of them.

Stanford says it will its divest holdings in coal companies over climate change concerns. It's the most prominent of the roughly one dozen colleges that have decided to sell off fossil fuel holdings.

A campaign in Africa to prevent HIV has persuaded 6 million teens and men to get circumcised and aims to sign up 14 million more. To do so, health officials must appeal to male vanity.