American architect Frank Lloyd Wright designed more than 1,000 structures during his lifetime. Among them is the Corbin Education Center on the Wichita State Campus.

Walking tours of the building will be offered Friday in honor of Wright's birthday.

Alan Aagaard is a WSU professor and will lead the tours. He'll talk about the architect's career and other familiar buildings in Wichita designed by Wright's students.

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.

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.

Russian antivirus firm Kaspersky Lab has discovered a piece of malware infecting computers mostly in the Middle East. Flame eavesdrops on conversations, takes screenshots and steals data from infected computers without being detected. Wired's Kim Zetter discusses how the malicious code works.

-- 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:

SpaceX's Dragon capsule has travelled safely to the International Space Station and back. The next step, says Space.com writer Clara Moskowitz, is to outfit the capsule for crew, which SpaceX hopes to complete by 2015. Until then US astronauts will hitch rides on Russia's Soyuz, at about $60 million a pop.

Transcript

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.

Transcript

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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