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Reporting in the journal Nature Communications,researchers write that they were able to track down the cells causing clogged arteries. Dr. Jill Helms, co-author on the study, discusses why stem cells are to blame and how the study could lead to more effective treatments.

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IRA FLATOW, HOST:

This is SCIENCE FRIDAY. I'm Ira Flatow. Meet Flame, every PC owner's worst nightmare. This newly discovered malware gives an attacker remote access to your computer. It can listen in on your conversations, look through your webcam. It was first detected in the Middle East and has been infecting computers for at least two years.

Alan Alda challenged scientists to explain what a flame is to an 11-year-old. Three months and more than 800 entries later he is back with the winner of the contest. Ira Flatow and guests discuss the winning entry and why the contest was an effective exercise in science communication.

The days are getting longer, and the kids are getting antsier.

Summer must be right around the corner.

So earlier this week, we led a chat on Twitter with Dr. Robert Block, a pediatrician who is president of the American Academy of Pediatrics, about some tips for a healthier summer.

In an action-packed half-hour, he tackled questions ranging from how to pick a sunscreen to how to get kids to eat better.

Here are some highlights from the chat, which was tagged #nprkids, on Twitter.

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-- Updated at 4:20 pm ET. See end of post --

President Obama opened himself up to withering Republican attacks Friday via an off-hand statement he made in a brief White House news conference.

Obama seemed to suggest that matters were going swimmingly for the private-sector part of the economy and that it was the reduction of government jobs that was the real problem.

Asked to respond to Republican charges that he was blaming Europe's economic policies for the alleged failure of his own domestic economic policies, Obama said:

It could very well end up being the song of this summer. Carly Rae Jepsen's "Call Me Maybe," a sunny pop song about a nascent crush, is No. 2 on the pop charts and No. 1 on iTunes.

But, perhaps the bigger sign that it has just crept everywhere is when someone on the Internet mashes up a President Obama remix.

More than 10,000 of you took our recent survey about how your family meals stack up against the Obamas'. And it turns out, you're a pretty healthy bunch.

This sounds like something we said in first grade:

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MICHEL MARTIN, HOST:

I'm Michel Martin and this is TELL ME MORE from NPR News. Now it's time for our weekly visit to the Barbershop where the guys talk about what's in the news and what's on their minds.

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RENEE MONTAGNE, HOST:

And today's last word in business is: Don't drive like my brother. That's the sign off heard each week at the end of NPR's most popular program. Were talking, of course, about CAR TALK. Brothers Tom and Ray Magliozzi have been dispensing humorous auto advice on the radio for more than 25 years. But today, the duo said they're putting the breaks on the program. In October they'll call it quits and no longer record new episodes.