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DAVID GREENE, HOST:

Now, as Isaac moves north from Louisiana, it could affect other parts of the country, and we'll be following that story as it develops.

The other big story we have been following this week is the Republican National Convention in Tampa, Florida. Today is the final day, and it's an important one for GOP presidential nominee Mitt Romney. He'll officially accept the nomination this evening. Yesterday, Romney took a break from the hubbub of the convention to do a little campaigning elsewhere. NPR's Ari Shapiro reports on his getaway.

It was Ann Romney and Janna Ryan's turn to campaign in Tampa Wednesday. The wives of the Republican presidential and vice presidential candidates made a pitch to female voters. And Mrs. Romney reached out to Latinos.

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STEVE INSKEEP, HOST:

We're getting a reminder here of how fiercely competitive this race is. Even as his party's convention is going on, Mitt Romney, campaigning in Indiana and President Obama, of course, not taking the week off - as rival candidates sometimes do during the opponent's convention. He's been making his case the last couple of days in college towns, trying to energize young voters.

And NPR's Scott Horsley is on the road with the president.

This week, Americans have been remembering Neil Armstrong. But before he walked on the moon, he had to solve a much more prosaic problem.

"You're about to embark on a mission that's more dangerous than anything any human has ever done before," Robert Pearlman, a space historian and collector with collectspace.com, told me. "And you have a family that you're leaving behind on Earth, and there's a real chance you will not be returning."

Scientists have known for decades that lab rats and mice will live far longer than normal if they're fed a super-low-calorie diet, and that's led some people to eat a near-starvation diet in the hopes that it will extend the human life span, too.

But a new study in monkeys suggests they may be disappointed.

The long-awaited results of this study, which started back in 1987, show that rhesus monkeys fed a diet with 30 percent fewer calories than normal did not live unusually long lives.

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STEVE INSKEEP, HOST:

This is MORNING EDITION from NPR News. I'm David Greene.

And I'm Steve Inskeep. Good morning.

We've been hearing, all morning, reports of Hurricane Isaac coming ashore along the gulf coast, and we're going, now, to Craig Fugate. He is the FEMA Administrator, the Federal Emergency Management Agency - and he is spending the morning on the gulf coast. Mr. Fugate, where are you now?

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STEVE INSKEEP, HOST:

Now, Greg mentioned Plaquemines Parish. Look at a map of Louisiana and you'll see that parish, a finger of land sticking far out into the Gulf of Mexico. Jennifer Hale of WVUE Television is in the parish, spent the night there. And Ms. Hale, where are you now?

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STEVE INSKEEP, HOST:

It's MORNING EDITION from NPR News. I'm Steve Inskeep.

DAVID GREENE, HOST:

And I'm David Greene. Hurricane Isaac made landfall last night in Louisiana and it is battering the Gulf Coast with high winds and a lot of rain. For the latest we turn to NPR's Greg Allen. He's in New Orleans and we have reached him by telephone. And Greg, give us a sense of this storm. It sounds like, you know, Category 1, which, you know, makes you not worry so much, but a lot of people fearing that it could just stay in one place for a good while.

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