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Also: Republican presidential contenders race toward Super Tuesday; fighting leaves more than 100 dead in Yemen.

Renee Montagne speaks with Kim Banta, assistant superintendent of schools for Kenton County, Ky. The town of Piner, which is in Banta's school district, was one of the hardest hit by recent tornadoes: at least four people were killed. But many residents are trying to return to normal life Monday — and that includes going back to school.

What happens when you turn convention on its head and look a the world from a totally different perspective? It's an exercise in opening the mind by turning expectations upside down.

The exquisite warp seen here is likely caused by interactions with other galaxies. Collisions or "harassment" between galaxies is quite common and may be the most important process shaping galactic evolution.

Across the Midwest and South, residents are cleaning up from Friday's outbreak of late winter storms. A seemingly nonstop barrage of tornadoes roared across rural farmland and cities all day and all night. Southern Indiana was among the hardest-hit areas.

Newspapers have chased audiences and advertisers to the Web and other digital platforms, where they are finding strong growth. But that transition has been rocky. A new study from the Pew Research Center's Project for Excellence in Journalism suggests there are ways to make the leap.

Demonstrators in Alabama are protesting the state's voter ID and tough immigration laws. They're calling it the "second" Selma to Montgomery March, marking the 47th anniversary of the historic civil rights march. Host Michel Martin speaks with two people covering the march: Orlando Rosa of La Jefa Radio and Birmingham News reporter Charles Dean.

The two leaders are meeting to discuss what to do about Iran. Both say that nation cannot be allowed to develop nuclear weapons. Obama will press for more time to let sanctions take effect. But he isn't ruling out military options.

Every habit-forming activity follows the same behavioral and neurological patterns, says New York Times business writer Charles Duhigg. His new book The Power of Habit explores the science behind why we do what we do — and how companies are working to use our habits to market products to us.

The National Hockey League wants to broaden its reach, particularly to African American students. So the NHL is joining forces with the Thurgood Marshall College Fund to offer scholarships to students in hockey programs to attend public historic black colleges and universities. Host Michel Martin talks with Johnny C. Taylor Jr., head of the fund.