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There has been a lot of talk about what's wrong with food deserts. First lady Michelle Obama, for one, says far too many people can't access the fruits and vegetables they need to be healthy.

The federal health law's expansion of Medicaid will cover some 16 million more Americans in the government program for the poor, if that part of the law survives the legal challenge it faces in the Supreme Court beginning next week.

Florida is leading 25 other states in that challenge, but that hasn't stopped two of Miami's most prominent hospitals from preparing for the Medicaid expansion.

As Illinois Republicans vote in their presidential primary, only one GOP candidate is expected to be in the state. Mitt Romney planned what he hopes to be a victory party Tuesday night in the Chicago suburb of Schaumburg.

Newt Gingrich is campaigning in Louisiana, which votes on Saturday.

Ron Paul is in California, which doesn't vote until June.

And Rick Santorum is in Pennsylvania, his home state, which votes on April 24.

We hear a lot about juvenile offenders when they commit a crime — and again, when they're sentenced to spend the rest of their lives in prison. But not much is known about what happens after the prison gates slam shut.

New analysis of a photo taken in 1937 has led investigators to think it might show a piece of the landing gear from aviator Amelia Earhart's Lockheed Electra plane, which disappeared in June that year somewhere in the South Pacific.

Vermont folk singer-songwriter Anaïs Mitchell's confessional ballads and strong, emotive singing have earned her comparisons to Leonard Cohen, Bob Dylan and Gillian Welch.

The USGS says an earthquake with a magnitude of 7.4 hit southwest Mexico today.

The United States Geological Survey says it was 6.2 miles deep and about 120 miles east of Acapulco.

We'll have more on this story as it develops.

Update at 3:54 p.m. ET. Back To Normal:

NPR's Jason Beaubien, reporting from the Zocalo area of Mexico City, says officials report no deaths and no major damage.

Our collective mental image of Mexican artist Frida Kahlo has been informed, mostly, by the vibrant self-portraits she painted over the years. But she also had a collection of photographs — about 6,500 of them — that were held privately for decades after her death at the request of her husband, Diego Rivera.

To "strengthen our ability to continue providing the world's most insightful and investigative reporting in journalism," The New York Times says that starting in April it will limit non-paying NYTimes.com visitors to 10 free articles per month, down from the current 20.

The Times adds that:

Update at 3:35 p.m. ET: It's official. Peyton Manning is indeed joining the Denver Broncos. He's talking with reporters in Denver right now.

Our Original Post:

"And they have a deal," The Denver Post reports. "An NFL source confirmed Tuesday morning the Broncos and quarterback Peyton Manning have agreed to a five-year, $96 million deal."

George Zimmerman's statement to police about what 17-year-old Trayvon Martin was up to on Feb. 26 in Sanford, Fla., "is completely contradicted" by the boy's cellphone records, an attorney for Martin's family just said during a news conference in Fort Lauderdale, Fla.

Transcript

MICHEL MARTIN, HOST:

I'm Michel Martin and this is TELL ME MORE from NPR News. Coming up, later in our mom's conversation we will pick up on an important conversation we know many people are having around bullying. Last week, we heard from a 15-year-old who'd been bullied at school for years. Today, we'll hear how his mom felt about hearing about this in a documentary. That's coming up later in the program.

Transcript

MICHEL MARTIN, HOST:

This is TELL ME MORE from NPR News. I'm Michel Martin. Coming up, spring has sprung, so a good greeting for today is not just, Happy Spring, but also Happy New Year if you celebrate the Persian holiday, Norouz. We'll find out more about it in just a few minutes.

In his latest book, Pakistan on the Brink, journalist Ahmed Rashid writes that he fears Pakistan "is on the brink of a meltdown."

"I fear almost anything could [send it over the edge]," he tells Fresh Air's Terry Gross. "There could be a major terrorist attack in the U.S. or Europe which is traced back to Pakistan. ... Then there's a very, very critical economic crisis in the country. There's no investment, no money, there's no energy — I live in Lahore. We've had no gas for six months."

A grand jury in Florida is going to investigate the killing of 17-year-old Trayvon Martin, a case that has grabbed national attention because of concern that the young man may have been a victim of racial profiling and that local police haven't been aggressive enough about looking into his death.

Orlando's WESH-TV reports that:

A lot of people think they have food allergies, but they're likely wrong.

That's partly because it's easy to confuse common food-related problems like lactose intolerance or celiac disease with an allergy. But it's also because there are a lot of tests promoted for food allergies that don't measure up.

The "horrific killings" this month of 16 Afghan civilians, allegedly by a U.S. Army staff sergeant, will be fully investigated and "justice will be done," a top Pentagon official just told the House Armed Services Committee.

An actuary named Cecil Bykerk spends his days walking a fine line.

As the head of the board that runs Iowa's health plan for uninsured residents who can't qualify for private coverage, he wants to make sure that folks who need insurance can get it.