Nasdaq Acknowledges Troubles With Facebook Deal

Students of Briarwood Elementary are reunited with their parents after a deadly tornado tore through the area.

As soon as I saw the tornado warnings on TV, I had to leave the office right away. I had photographed about a dozen tornados in my decade in Oklahoma and if I didn't get into my car before the funnel cloud swept through, I knew I would get stuck in traffic and arrive too late at the scene.

Security company G4S said Chief Executive Nick Buckles, who was heavily criticized over the company's handling of the London Olympic Games last year, will resign at the end of the month.

Crude oil futures were steady in Asia in sluggish trade, as market participants remained on the sidelines ahead of Federal Reserve Chairman Ben Bernanke's testimony to the U.S. Congress on Wednesday.

A study showing how ants tunnel their way through confined spaces could aid the design of search and rescue robots, say scientists.