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.

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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:

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IRA FLATOW, HOST:

This is SCIENCE FRIDAY. I'm Ira Flatow. Last week, the SpaceX Dragon capsule splashed down in the Pacific, wrapping up a glitch-free journey to the International Space Station. It was an historic first. The Dragon is really the only private spacecraft to have made the trip. This time there was only cargo aboard. But it will be - not be long before astronauts are hitching rides on the Dragon? That's what SpaceX is planning for next, and they hope to have seats ready for travelers by 2015. So you can mark that in your calendar.

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IRA FLATOW, HOST:

You're listening to SCIENCE FRIDAY. I'm Ira Flatow. Our next story is about one person's garbage being another person's treasure. You know how that works. Well, this one is a very interesting story. Last year, the National Reconnaissance Office, they operate America's spy satellites, well, the National Reconnaissance Office called up NASA with an offer: Would NASA like a couple of old spy telescopes? We don't need them. Could you do anything useful with them? We'll give them to you.

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IRA FLATOW, HOST:

This is SCIENCE FRIDAY. I'm Ira Flatow. If you look up in the sky at night, especially later this year, you can spot the Andromeda Galaxy, it's a small cloudy smudge in space. It's our galaxy, the Milky Way's closest galactic neighbor, about two and a half million light years away.

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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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.

Family, friends and colleagues from across the nation are remembering retired Kansas politician Billy McCray who died June 2.

Funeral services for McCray will be held in Wichita Friday morning.

The long time Democrat, served in the state legislature for 18 years both in the House and Senate. He worked for the Boeing Company in the 1950’s.

Former state Senator, Rip Gooch said he and his friend were in unique positions at Boeing for people of color at that time; Gooch was a flight inspector and McCray a photographer.