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An NTSB board member says the train was traveling at 106 mph while making a turn in a 50-mph zone. Tuesday night's derailment in Philadelphia claimed seven lives; dozens were injured.

Two more candidates got in on the Republican side Monday, including Ben Carson, who is black, and Carly Fiorina. It's the most diverse GOP field anyone can remember. But will it make a difference?

With a little help, scientists say that seaweed growing along the Maine and New Hampshire coasts could become the "kale of the sea." The first step is teaching chefs and consumers how to enjoy it.

With a single move, Rikers Island prison has taken the lead on prison reform on one issue: It banned the use of solitary confinement for inmates under 21 years old.

San Francisco is one of many U.S. cities rolling out incentives to grow food on unused land. But some San Franciscans argue that land should be used to address the acute affordable housing shortage.

Health Minister Aaron Motsolaedi faced an HIV/AIDS crisis when he took office in 2009. He's made great progress on that front. His new campaign: Convincing South Africans to live healthier lives.

The mayor of New York City wants you to see what an hour's, a day's, a year's worth of NYC's carbon dioxide emissions would look like — if you could see them. The gas is normally invisible. So he's made a video, and it ain't pretty. Why would the mayor do this? What's it look like? See for yourself.

One of Billie Holiday's most iconic songs is "Strange Fruit," a haunting protest against the inhumanity of racism. Many people know that the man who wrote the song was inspired by a photograph of a lynching. But they might not realize that he's also tied to an iconic event in America's history.

When it comes to health care in the U.S., no two states are more different than Texas and Massachusetts, which boast the highest and lowest rates of uninsured people, respectively. Those differences come into stark relief in the lives of Texan Melinda Maarouf and Massachusetts resident Peter Brook.

The market for children's books is huge: Consumers buy $3.1 billion children's books annually. Now, with e-books and apps taking off, there are new opportunities to turn traditional story books into interactive experiences. Guest host Mary Louise Kelly talks with Dan Poynter, consultant and publisher at Para Publishing, and Roxie Munro, an author and illustrator of more than 30 children's books, about where children's books are headed.