Ashrita Furman wants to build a tennis racket the size of a bus, and show it off at the U.S. Open. It's so big, he was told it's considered a building so he would need a permit.

Fiction and nonfiction releases from Bernard Cornwell, Hisham Matar, Madeline Miller, Sally Jacobs and Jim Steinmeyer

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Even though Isaac has been down graded from its hurricane strength, it hasn't lost all its punch. The storm continues drench Louisiana and Mississippi, and it's making it difficult to restore electricity and to get a full sense of damage.

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DAVID GREENE, HOST:

But now to Tampa, where this evening Mitt Romney will formally accept his party's nomination for president.

Last night, though, the stage belonged to vice presidential nominee Paul Ryan. In a campaign, it often falls to the running mate to be the attack dog and Ryan sounded up for the job. It was also a chance for the rising GOP star to defend his own ideas.

Here's NPR's national correspondent Mara Liasson.

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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.

Marlaine Peachey works in the mayor's office in Mandeville, La. During severe weather she mans the office 24-7. She tells Steve Inskeep that Hurricane Issac was a water event they didn't expect.

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

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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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."