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Rick Santorum's departure from the presidential race means Mitt Romney is finally in a position to draw to his ranks that part of the Republican electorate that until now has preferred his numerous rivals, virtually each of whom has risen to challenge him only to fall, the latest and last being the former senator from Pennsylvania.

The technology world is abuzz over Facebook's $1 billion deal to acquire the photo-sharing app Instagram. Two years ago Instagram didn't exist. Some reasons behind the company's meteoric rise: apps are everywhere and Instragram took advantage of the moment with a playful, easy-to-use service. Now Instagram's fans wonder whether its identity will be retained.

In an unprecedented move, an entire Division I team is relocating from one university to another. The sport is chess, and the coach, Grandmaster Susan Polgar, tells Robert Siegel she is flattered that her tight-knit international team is moving with her from Texas to Saint Louis.

President Obama has embraced the billionaire investor Warren Buffett since 2008, and lately he has made use of Buffett's statement about paying a lower tax rate than his secretary pays. Now it's becoming part of the Obama re-election plan.

Several teachers have been disciplined, and even fired, for their online activities. A Philadelphia teacher was suspended after posting that students acted like "rude, disengaged, lazy whiners." And a Georgia teacher was forced to resign over a Facebook photo that showed her drinking alcohol.

Bo Xilai, once a rising star in the Chinese Communist Party, has been removed from his highest posts in the party. The news comes as Bo's wife is under investigation in connection with a murder case. Audie Cornish speaks with James Fallows of The Atlantic, about the political rise and fall of Bo and the details of the case.

Bobby Clark, 54, was one of three people killed in Friday's shootings in Tulsa, Okla. Friends and family say Clark, a resident of the city's Northgate neighborhood, was a well-liked musician who enjoyed sharing his music with others

An Institute of Medicine panel says a tax of half a percent or so on medical transactions could help the nation's public health agencies tackle pressing goals, such as reducing adult obesity. In the long run, that could result in big savings in health care spending, the panel says.

As Tulsa police sought suspects in last week's deadly shootings, black and white leaders urged the community to remain calm. The united front was just one indicator of how race relations have improved since the city's 1921 race riot, arguably the worst in U.S. history.

Matt Groening tells Smithsonian magazine that the show's location is based on Springfield, Ore. He credits the idea of naming it Springfield to the hit TV show Father Knows Best.