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Frostbite isn't on most people's health worry lists. But this week it's a concern for millions of people who live in places that don't usually contend with serious risk of cold injuries. Extremities can be affected by frostbite even when bundled up.

Officers dispersed the protest over the death of Kelly Thomas, after a TV videographer was attacked.

As many as 15 percent of babies have colic, which can cause bouts of inconsolable crying. Researchers are testing probiotics to see if these good bacteria can help. But they don't know how the supplements work, or how they may affect children's health long term.

Michigan is one of only a handful of Republican-led states that is expanding Medicaid under the Affordable Care Act. It did it by forging a plan that worked for Republicans, Democrats and business interests, as well as doctors and hospitals.

An arctic air mass is blanketing the eastern half of the nation today, bringing with it high winds and heavy snow accumulations in some areas. Thousands of flights have been cancelled, schools are closed and federal government offices are closed. Those who don't have to drive or be somewhere also have an opinion on the weather.

There's more evidence that the housing sector has come out of its deep slump. The day's other key economic indicator: The number of people who applied for unemployment insurance barely changed last week. The pace remained near where it was before the economy slipped into its 2007-2009 recession.

The new regulations would grant exceptions on a case-by-case basis for the wearing of turbans or yarmulkes, as well as beards or tattoos with religious significance.

Spain's Rafael Nadal reaches his third Australian Open championship after defeating his longtime Swiss rival 7-6(4), 6-3, 6-3 Friday in Melbourne. Nadal faces Stan Wawrinka in the final.

Gloria is a new film from Chile that centers on a late-middle-aged divorced woman whose life is full of ambiguity. She's played by Paulina Garcia, who won the top acting prize — the Silver Bear — at the 2013 Berlin Film Festival, where the movie was a surprise hit. It opens this week in New York and Los Angeles, and wider next month.

In technology news this week: Apple's iconic baby celebrated a big birthday, the debate over Edward Snowden and NSA data collection continued to simmer, and the Target data breach prompted more talk about credit card security.