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Close to 40 percent of kids in Philadelphia live in poverty — but discussion of the link between poverty and student achievement is almost absent from an ongoing debate to fix schools. Public health and education experts say poverty and hunger undermine children's development.

"This little baby — what my wife used to call my 'pretend money project' — is really going mainstream," says the chief scientist at the Bitcoin Foundation.

Not counting a 16-year break the British science-fiction TV series took around the 1990s, Doctor Who is celebrating its 50th anniversary on Saturday. There's a special in 3D that's going to be simulcast in 75 countries, and the BBC has made a movie about the history of Doctor Who.

Advocates for low-wage workers are using a Wal-Mart store's food drive for its own employees as an example of why the federal minimum wage of $7.25 an hour should be increased to help keep up with inflation.

A massive hole opened up as much of a supermarket's roof fell down on shoppers and store employees. Several firefighters who responded to the scene were also killed by falling debris.

Missing out on good quality sleep has emerged as a real medical issue. Now Harvard researchers say men who had trouble falling asleep were more likely to die prematurely than men who said they could doze off easily. There's no proof sleeplessness caused an increase in mortality, but the association was strong.

Fresh Air's Dave Davies discusses John F. Kennedy's abbreviated term in office with presidential historian Robert Dallek, who finds that while you can make an argument that Kennedy accomplished little, he represents something special in the American experience. Dallek's latest book is Camelot's Court: Inside The Kennedy White House.

When an Afghan toddler in Albuquerque was tested for lead at preschool, the child's blood levels were off the charts. A baby's brother's was, too. Why? It turns out that kajal, a traditional eyeliner used by the family, was 54 percent lead. It's a reminder of the health hazards posed by traditional cosmetics.

At this week's show, a long and large four-seater has drawn more notice than perhaps any other car, with attendees calling it "insane" and "deranged." The Youabian Puma's makers say the car has only one goal: "to stand out and be unique."

Walter Cronkite anchored the CBS News coverage during the first hours after bullets hit President Kennedy in Dallas 50 years ago Friday.