Before President Obama welcomes world leaders to Camp David and Chicago, new French President Francoise Hollande is expected to say he wants his nation's 3,300 troops home from Afghanistan by year's end. That could upset other NATO nations.

Among the key things to know about what's in the hundreds of pages of evidence and other materials related to the Feb. 26 shooting death of Florida teenager Trayvon Martin, which were released Thursday:

Facebook's much-publicized first sale of stock to the public started with a bang late this morning as the price per share jumped. But though the volume of shares sold was a record for an initial public offering, the stock's price gave up its gains as the day continued.

By the end of trading in the U.S., Facebook had settled right at the $38 initial offering price that had been set before shares went on sale.

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The president makes the food security announcement as world leaders prepare to meet at Camp David.

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This G8 summit coming this weekend includes leaders from the world's largest economies and they'll be discussing what to do about the very troublesome economy in Greece.

INSKEEP: Greece keeps cutting its budget to help pay debts and avoid default, but then its economy keeps contracting, making the problem worse.

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Let's take a moment, now, to remember Donna Summer. She died of cancer yesterday at age 63.

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The Boston native, a 10-year-old soloist in her church choir, grew up to make music that defined the dance floor, the poolside, and the beach in the 1970s and '80s.

(SOUNDBITE OF SONG, "BAD GIRLS")

DONNA SUMMER: (Singing) Bad girls, talking 'bout the sad girls. Sad girls, talking 'bout bad, bad girls, yeah.

GREENE: And she was known as the Queen of Disco.

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Now let's talk about the money the campaigns themselves raise. All through the Republican primaries, President Obama's campaign raised far more money than Mitt Romney's campaign. But now the money gap is narrowing, as NPR's Peter Overby reports.

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

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And I'm Steve Inskeep.

Americans now have a little more information on which to base their debate about Trayvon Martin. The teenager's killing in Florida - where he was shot by a man named George Zimmerman - prompted an intense and politically charged national discussion about violence, about gun laws and about race.