Eyder Peralta

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The halls of the Kiambu County Hospital just outside Nairobi are empty. This is normally a bustling place but on Thursday entire wings are closed.

Only in the emergency room are there a scattering of patients. Moms with babies sit languidly on metal chairs. Men with broken bones and some with serious injuries are just hoping to be treated.

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In his lab at George Mason University in Virginia, Sean Luke has all kinds of robots: big ones with wheels; medium ones that look like humans. And then he has a couple of dozen that look like small, metal boxes.

He and his team at the Autonomous Robotics Lab are training those little ones to work together without the help of a human.

In the future, Luke and his team hope those little robots can work like ants — in teams of hundreds, for example, to build houses, or help search for survivors after a disaster.

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Today is 3/14, also known as Pi Day. NPR's Eyder Peralta reports on why pi still matters.

EYDER PERALTA, BYLINE: Here's how mathematician Carlos Castillo-Chavez describes pi.

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Play ball - spring training starts in just two days. And Major League Baseball will continue its efforts to speed up the game with several new rules. NPR's Eyder Peralta reports.

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And now let's hear about guns from a different perspective - some gun owners themselves. NPR's Eyder Peralta went to a gun shop in Virginia, where sales are up. Guns have been flying off the shelves of late as talk grows louder of new regulations.

Pennsylvania Avenue was beginning to buzz. The pope was about to finish his speech to Congress, and crowds of people started lining the street to catch a glimpse of the pontiff.

So far, Pope Francis has become the first pontiff to speak before a joint meeting of Congress. He's also the first pope to canonize a saint on U.S. soil.

But the thing that everybody is talking about is that he's definitely the first pope to ride around town in a little tiny car.

Bill Newbrough, 51, and his co-workers stood on the sidewalk. They were talking about the car.

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