Children are diagnosed with lead exposure only when their health is already endangered. Wouldn't it be better to prevent that danger instead? That's the goal of a project in the city of St. Louis that tests the homes of pregnant women and removes dangerous lead before babies were born.

That SWAT-team approach can reduce children's exposure to toxic lead, according to a new study.

Yelp surprised analysts today during its first hours of trading as a public company.

As the Seattle PI puts it, the user-review company's shares soared by as much as 60 percent in early trading. The stock opened at $22.01 a share and has hit a high of $25.10.

South Sudan gained independence in 2011, but it has been locked in a bitter conflict with its northern neighbor. Rep. Frank Wolf (R.-Va.) just returned from the area. He talks with host Michel Martin about what some observers are calling a humanitarian crisis, and what the U.S. can do to help.

A California woman's nearly $168 million award from a jury is "believed to be the largest for a single victim of workplace harassment in U.S. history," the Los Angeles Times reports.

Among the reports of more deadly violence in Pakistan today — about 70 people were killed in three incidents, DAWN reports — is word that about 20 of the deaths were the result of one militant group attacking another.

Good morning.

Our early headlines:

-- On Iran, Obama Says 'I Don't Bluff' And 'All Options Are On The Table'.

-- Tornado Trauma: Five Died On One Short Street; More Storms Due Today.

President Obama tells both Israel and Iran through an interview with The Atlantic that "as president of the United States, I don't bluff," when he leaves open the possibility of a U.S. military strike against Iran's nuclear program.

After weeks of shelling and sniper fire from Syrian Army forces, the people who remain in the Baba Amr district of the city of Homs may finally get some aid from the outside world today.

It would be easy not to have known Continental Airlines has been merged with United for two years. That will change Saturday when all operations and branding are combined under just United. Any hiccups could mean delays throughout the airline's system.