What to know now:

1. Democrats in Iowa town hall: The three Democratic presidential hopefuls took part in a town hall meeting Monday, hosted by CNN. The event, held in Des Moines, Iowa, saw former Secretary of State Hillary Clinton, Sen. Bernie Sanders, (I-Vt.) and former Maryland Gov. Martin O'Malley answer questions from a Democratic audience. Sanders explained how taxes would be increased to pay for health care, O'Malley said he would continue his fight for the environment and  Clinton vowed to work with Republicans if she is elected president.

2. What time is it: Scientists say they will announce Tuesday if they think the world is any closer to a global disaster when they reveal the time left on a "Doomsday Clock." The Bulletin of the Atomic Scientists will say where the minute hand rests on the metaphorical clock that is meant to illustrate how close the world is to a potential disaster from nuclear weapons, manmade environmental damage or new technologies.

3. No more solitary: President Barack Obama on Monday told wardens in the federal prison system that they could no longer place juvenile offenders in solitary confinement.  Obama also said he wants jailers to limit the use of "punitive segregation" in general. The change is aimed at 10,000 federal prisoners, but the president says he hopes the new rules will "serve as a model for state and local corrections systems."

4. FSU settlement: Florida State University has agreed to pay nearly $1 million to settle a claim from a woman who sued the school after she said she was raped by its former star quarterback, Jameis Winston.  Erica Kinsman's suit claims the school violated federal law  by showing "deliberate indifference" to her claims of a  sexual assault by Winston.  Federal Title IX laws require an institution to investigate claims of assault. According to FSU's president, Kinsman will get $250,000 and her attorneys $700,000. Kinsman's attorneys dispute that claim.

5. Prof. charged with assault: An assault charge was filed Monday against a University  of Missouri assistant professor who was captured  on video calling for "some muscle" to remove a student journalist from a protest on campus last fall. Melissa Clark faces a charge of simple assault after she had physical contact with the student who was trying to report on the schools attitudes toward black students. Clark works in Missouri's Communications department.

And  one more

A young father from North Carolina was killed Friday when he went to help a man who had spun off the road during last week's winter storm. Jefferson Heavner was shot by Marvin Lee after Heavner and several others tried to push Lee's car from a ditch. Lee became belligerent as the group tried to help him, witnesses say, then he opened fire on the men,  shooting and killing Heavner.

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Which one would you drive if you could?