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The image of the lone genius toiling in isolation, finally emerging with a brilliant new concept is compelling, even romantic. Too bad it's not true.

Instead, innovation thrives in ecosystems, much as microbes flourish in a warm, cozy petri dish.

"There's an important geography to where innovation happens," says AnnaLee Saxenian, dean of the School of Information at the University of California, Berkeley, who studies how regional differences affect innovation.

Yes, we've seen this before: a study showing large spending disparities to treat similar ailments and little if any link between expenditure and effectiveness.

What's different about a new analysis is the patients.

In public, at least, they're the best of friends. And no one will have a more public role extolling President Obama than his Democratic predecessor, former President Bill Clinton.

Clinton, who has already been featured in an Obama campaign ad, is speaking tonight at the Democratic National Convention in what is traditionally the prime spot reserved for the vice presidential nominee.

"He's clearly the best asset the Democrats have," says GOP consultant David Carney. "Clinton is their best surrogate."

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MICHEL MARTIN, HOST:

I'm Michel Martin and this is TELL ME MORE from NPR News. The Democratic National Convention is underway in North Carolina. We'll speak with the president of the U.S. Conference of Mayors, Philadelphia's Michael Nutter, about some of the local issues mayors are thinking about as they gather in Charlotte.

But first we want to talk about the message the Democrats are trying to send from the convention podium. Last night's keynote speaker was San Antonio's Mayor Julian Castro. He shared his American dream story.

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MICHEL MARTIN, HOST:

This is TELL ME MORE from NPR News. I'm Michel Martin. Coming up, there are a lot of college ranking guides out there, but we're going to tell you about one of them that says it rates colleges and universities on their value to you and to the country. That's ahead.

But first, we're following the Democratic convention in Charlotte, and while the spotlight is on national debates during the convention, we remember that old saying that all politics is local.

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MICHEL MARTIN, HOST:

I'm Michel Martin and this is TELL ME MORE from NPR News. Coming up, I had some thoughts about why we so love to show our scars. We, meaning the public and our leaders. That's my Can I Just Tell You essay and it's in just a few minutes.

But, first, it's time for our Wisdom Watch. That's the part of the program where we speak with those who've made a difference through their work and, in this political season, we're talking with a political pioneer.

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MICHEL MARTIN, HOST:

Switching gears now, school is back in session in much of the country and for many high school students that means it's time to look at colleges and, increasingly now, as more students go to college than ever, they and their parents are turning to rankings, such as the one published by U.S. News and World Report, to try to figure out the best fit.

The Pacific coasts of Costa Rica, Panama and Nicaragua are no longer the focus of tsunami warnings, the Pacific Tsunami Warning Center announced just after 1 p.m ET.

As we've been reporting, there was a strong — 7.6 magnitude — earthquake in Costa Rica this morning. At first, there were concerns about possible tsunamis from Mexico south to Chile. As the day continued, however, authorities gradually reduced their warnings.

When it comes to candy, most people fit into two camps — either you savor your candy, or you devour it right away.

If you're a "savorist," you'll be happy to learn that certain spherical candies can take up to a half-hour to dissolve if you don't bite into them, at least according to some research recently submitted to the journal Physics Education.