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"A major icing event is forecast through Friday across portions of the southern Great Plains toward the Lower Ohio Valley," the National Weather Service says. Some are saying an ice storm Friday and Saturday will be the nation's worst since 2009.

Food as a symbol of politics, diet, gender roles, technology, isolation, gluttony and blatant commercialism has been with us for ages and in many forms. A massive exhibit explores how American artists, from Pilgrim times to Andy Warhol, used paintings of food to shape and reflect our national identity.

Politics in Minnesota and Wisconsin historically have been pretty similar, but that's no longer the case. Wisconsin is now advancing conservative policies and lending a Midwestern face to the Republican Party, while Minnesota's agenda has been among the most liberal.

When bees disappeared from central China years ago, Chinese apple farmers had to pollinate by hand. Embarrassing — people doing bees' work, but then came the big discovery –- a surprise that still haunts the conservation movement. What if people outperform bees?

President Obama ordered that U.S. flags be flown at half-staff until Monday — a symbolic gesture of a nation in mourning. It's a tradition observed by countries around the world, one that began as early as the 17th century.

During the Cold War, successive U.S. leaders supported the white South African government because it staunchly opposed communism. Mandela's African National Congress, meanwhile, had many ties to the Soviet Union and viewed it as more sympathetic to their cause than the U.S. and other Western countries.

An increasing number of people are signing up for health insurance through the government's new exchange, suggesting the Obama administration has made progress in fixing its broken website. But the exchange is just one part of the health care law, which remains politically divisive almost four years after its passage.

Vitali Klitschko has emerged as one of Ukraine's most popular opposition figures, in part because he earned his wealth in the ring and appears to be untouched by the country's corruption scandals. The boxer known as "Dr. Ironfist" has his eye on the presidency, but there are concerns about his lack of experience.

So many spies have reportedly targeted gamers that a central group must try to keep track of them all. That's the latest revelation from documents leaked by former NSA contractor Edward Snowden and reported by the Guardian and other outlets.

As the world mourns Nelson Mandela, many Americans are remembering their involvement in his life. Celeste Headlee speaks to Sharon Gelman, of Artists for a New South Africa, which was founded in 1989 by actors like Alfre Woodard and Danny Glover, to fight apartheid.