Mark Memmott

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.

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.

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:

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.

Along with the latest news about the U.S. Army staff sergeant who allegedly murdered 16 Afghan civilians on March 11, we want to note this heart-breaking quote from a man who says he lost almost all his family in that massacre:

Here are some of the latest developments in a story that has captured attention across the nation and raised again the issue of race relations in America — the killing of 17-year-old Trayvon Martin in Sanford, Fla., last month:

Another wave of bombings in Iraq killed dozens of people today and wounded about 200 in more than a dozen cities and towns.

According to The Associated Press, it's the kind of violence "officials had dreaded in the run-up to a Baghdad meeting of the Arab world's top leaders, which the government hoped would showcase the nation's stability." That summit is scheduled for next week. As the AP adds:

More than 80,000 of Albert Einstein's papers, including his most famous formula — E=mc² — and letters to and from his former mistresses, are going online at Hebrew University of Jerusalem.

As NPR's Lourdes Garcia-Navarro says on All Things Considered, "what the trove uncovers is a picture of complex man who was concerned about the human condition" as well as the mysteries of science.

This week the action in the race for the 2012 Republican presidential nomination is in Illinois, which holds its primary Tuesday.

In advance of that contest, Public Policy Polling is out with a new survey that it says shows "Mitt Romney is headed for a blowout victory." It has the former Massachusetts governor ahead of former Pennsylvania Sen. Rick Santorum 45 percent to 30 percent (with former House Speaker Newt Gingrich and Rep. Ron Paul trailing far behind).

Peyton Manning, one of the two or three best quarterbacks in recent years and one of the greatest ever, is close to signing a contract to play for the NFL's Denver Broncos, according to multiple reports.

ESPN's Chris Mortensen and Adam Schefter say the deal is done "barring a snag during intensified contract negotiations" between the team and Manning's agent, Tom Condon. They cite "multiple sources."