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The March issue of the medical journal, Pediatrics, features a striking editorial. It begins with the following sentence: A new pediatric problem is in town. That new problem, according to the editorial, is gender identity disorder in children. Pediatricians are apparently seeing more young patients who express an interest in changing their gender. NPR's Alix Spiegel reports.

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This is MORNING EDITION, from NPR News. I'm Renee Montagne.

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And I'm Steve Inskeep. Good morning.

One more Arab nation is changing a longtime leader. Yemen's president for 33 years was Ali Abdullah Saleh. Today, millions of Yemenis vote. And they're being asked to ratify a plan under which Saleh's vice president will replace him. NPR's Kelly McEvers is in Yemen's capital Sana'a.

And, Kelly, where exactly are you in the capital city?

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Some new research throws into question things we say all the time about the Internet. The research focuses on Twitter, the service that lets many millions of people send short messages to each other from computers or cell phones. It's commonly said that social networking like this is revolutionary, that it's created new communities, even that it's obliterated geography. You can connect with people who share common interests, not just people who happen to live nearby. NPR's Shankar Vedantam is here to explode all that. Hi, Shankar.

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And today's last word in business follows up on the business of Jeremy Lin, the Chinese-American sensation for the New York Knicks. You know, if you had a dollar for every news story that has used puns on his name, like linsanity, you would be lincrediably wealthy, but we would never lindulge in such things. So let's go straight to the way people are making money.

Rhythm in music is about timing — when notes start and stop. And now scientists say they've found a curious pattern that's common to musical rhythm. It's a pattern also found in nature.