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STEVE INSKEEP, HOST:

Just to keep us up to date here on Hurricane Isaac, it's become a tropical storm and forecasters expect to downgrade it to a tropical depression by this evening. That is small comfort, though, to people facing the storm's strong winds and heavy rains. States as far north as Ohio could feel Isaac's effects.

DAVID GREENE, HOST:

The more than $3.5 billion deal was signed during a visit to China by German Chancellor Angela Merkel.

Republican Vice Presidential nominee Paul Ryan addressed the Republican National Convention last night. Steve Inskeep talks with Politico's Jonathan Martin about how Congressman Ryan became Mitt Romney's choice for vice president.

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Let's follow up on another story. Earlier this year, five big banks settled the so-called robo-signing case, admitting they rushed the foreclosure processes for thousands of homeowners. Now, those banks are working to forgive and modify $20 billion worth of home loans.

As NPR's Yuki Noguchi reports, yesterday was the first chance to look at how banks are handling this part of the settlement.

YUKI NOGUCHI, BYLINE: Joseph Smith's first full report wasn't due until November, but he was eager to keep the issue top of mind.

Turkey's foreign minister plans to ask the U.N. Security Council to establish a safe zone inside Syria for refugees fleeing the war there. With close to 100,000 refugees already in camps on Turkish territory, the foreign minister says his government lacks the capacity to host more.

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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.