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KNOW IT ALL: Friday's Top 7 Stories at NBC News

Clinton and Sanders rumbled in Milwaukee.
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Good morning. Here are some of the headlines we're following this morning:

1. Clinton Tries New Attack to Cool the Bern: 'Single Issue' Sanders

Hillary Clinton sought to douse Bernie Sanders’ perceived passion with a cool dose of realism in Thursday night's debate featuring lengthy exchanges on foreign policy, race and Barack Obama's legacy. She ended the evening with a devastating new line: “I am not a single issue candidate and I do not believe we live in a single issue country.” Read more in POLITICS.

2. Why Race Was a Hot Topic in Democratic Debate

Black and Latino support could make all the difference in determining which Democratic candidate comes out on top ahead of Super Tuesday. For Hillary Clinton, minority communities are often considered her firewall in ensuring her success. But Bernie Sanders came out of Thursday night’s presidential debate with momentum at his back, ready to chip away at Clinton’s core support. Read more in POLITICS.

3. World Powers Agree to Syria Ceasefire, Kerry Says

The deal announced in Munich in the early morning on Friday, local time, follows marathon talks with Russia and more than a dozen other countries. It also calls for the swift expansion of humanitarian aid and the resumption of peace talks in Geneva as soon as possible. Read more in NEWS.

4. Pope to Meet Patriarch: What You Need to Know

When the pope and the patriarch come together for the first time today, one of Christianity’s most enduring divisions could edge closer to becoming ancient history. The Roman Catholic and Orthodox churches have been at odds for over 1,000 years. Friday's meeting in Havana — where Pope Francis and Patriarch Kirill will sign a joint accord — could be a critical step towards helping heal the rift. Read more in NEWS.

5. Polar Vortex to Usher In 'Life-Threatening' Icy Blast

The National Weather Service said the "life threatening" icy blast was set to arrive in the region Saturday, but the coldest air would not arrive until Sunday morning — with several cities facing the prospect of subzero temperatures. Read more in NEWS.

6. Cliven Bundy, Father of Rancher Resistance, Faces Prison

Renegade rancher Cliven Bundy is, in many ways, the father of the anti-government resistance that spawned a deadly standoff at an Oregon wildlife refuge. And now, like his two sons and many of his proteges, he's facing prison. Read more in NEWS.

7. Paternity-Leave Poster Boy: I Cheated on Pregnant Wife

A lawmaker who made headlines in Japan as the poster boy for paternity leave quit on Friday after admitting to a tryst with a kimono fitter days before his wife gave birth. Read more in NEWS.

8. Meet The CEO Who Started A Headband Business in College

Jess Ekstrom's company, Headbands of Hope, creates handmade headbands for girls who are losing their hair from chemotherapy. She launched the idea in her college dorm room and got her whole university involved; now it's a full-fledged business.