Children who are exposed to methamphetamine before birth can have behavior problems as young as age 3, a new study finds. But those problems are manageable, the researchers say, especially if the children and their parents get help early on.

"These kids are not cracked and broken," says Linda LaGasse, an associate professor of pediatrics and Brown University Medical School, and lead author of the study. "But they do have problems that are worthy of note."

Pope Benedict XVI is set to begin his tour to Mexico and Cuba on Friday. It will mark the pope's first visit to Spanish-speaking countries in Latin America.

With his visit, there have been two interesting developments:

-- First comes news that over the weekend, the Knights Templars Cartel in Mexico called for a temporary halt in the violence while the pope is in town.

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).

Iran has faced international sanctions for more than three decades, which have hurt, but never crippled its economy.

Now, a new move by a relatively obscure financial institution in Europe could make it much more difficult for Iran to do basic things crucial to its economy, such as selling oil and obtaining hard currency.

As of Saturday, many Iranian banks, including the Central Bank, have been refused access to a worldwide financial messaging system that's used to arrange transfers of money.

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."

Russians continue to take to the streets to air their grievances against the government of Prime Minister Vladimir Putin. But now, after Putin's election this month to a six-year term as president, the crowds number only in the hundreds — not the tens of thousands that turned out before the vote.

In the words of writer Boris Akunin, a popular speaker at the earlier rallies: "The civic movement has entered a new phase. The first phase, romantic and euphoric, is over."

Now is the time, Akunin says, for power to develop from the bottom up.

While most of the country has been enjoying spring-like temperatures for weeks now, parts of Arizona got a pretty significant visit from a waning winter: CNN reports that "the city of Flagstaff is still digging out of 10 to 14 inches of snow from the weekend, which prompted school closings in the city for Monday. The city of Prescott received 8 to 12 inches."

Dick Teresi wanted to write about how science determines the point between life and death. After a decade of research, Teresi says he still doesn't know what death is, but that the breadth of his ignorance has been widely expanded. Teresi's findings have been published in his new book, The Undead: Organ Harvesting, the Ice-Water Test, Beating Heart Cadavers — How Medicine Is Blurring the Line Between Life and Death.

Last month, Tell Me More used audio of storyteller Mike Daisey, who had been featured in a public radio story on the show This American Life. Last Friday, This American Life host Ira Glass retracted the story, saying it "contained numerous fabrications." Host Michel Martin notes the use of part of the retracted story on Tell Me More.

A New Jersey jury found 19-year-old Rutgers University student Dharun Ravi guilty of a hate crime for using his webcam to spy on his roommate Tyler Clementi. Clementi was having an intimate encounter with another man in their dorm room and a few days later he committed suicide. Host Michel Martin discusses the case with law professor Jessica Henry.