Morning Edition

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STEVE INSKEEP, HOST:

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.

Steve Inskeep has the Last Word in business.

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.

The financial battle for the Republican nomination is tightening. Candidates spent a lot of cash in January — what with contests in Iowa, New Hampshire, South Carolina and Florida. Also spending a lot of money, as it turns out, were the richly financed superPACS that support the candidates.

Reports filed at the Federal Election Commission on Monday night show just how important a superPAC can be.

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RENEE MONTAGNE, HOST:

A 150 lbs. emu escaped from its pen five weeks ago, and it's been spotted several times. Last week, the flightless bird was seen outside an elementary school. A maintenance worker there tried to lasso the elusive emu with an extension cord, but the big bird got free.

Renee Montagne has business news.

Renee Montagne has business news.

Former Pennsylvania Senator Rick Santorum has been the hot story in the GOP presidential contest this month. Over the weekend, Santorum raised eyebrows with comments on public education, prenatal testing and what he called President Obama's "phony theology." Santorum was making waves just days ahead of the next Republican debate on Wednesday, and the next primaries in Michigan and Arizona six days later.

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RENEE MONTAGNE, HOST:

This is Morning Edition from NPR News. I'm Renee Montagne.

Senegal, on the coast of West Africa, has been something of a model of stability for a region known for its volatility. But this past week has brought protests and violence to Senegal after demonstrations over a presidential election this coming weekend led to clashes with riot police. We've got NPR's Ofeibea Quist-Arcton on the line from the capital Dakar to tell us what is going on there.

Good morning, Ofeibea.