KNOW IT ALL: Monday's Top 6 Stories at NBC News

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Good morning, and happy Groundhog Day. Here are some of the stories we’re following today:

1. Snowstorm snarls yet another Monday morning commute

Speaking of Groundhog Day, it's déjà vu for millions of people facing trouble getting to work Monday, just a week after a storm slammed the Northeast. The new storm started Sunday in Nebraska before a slow march east. For Chicago, the snowstorm was the city's sixth biggest on record, with 18 inches expected to have fallen by dawn Monday. Detroit set a new daily snowfall record Sunday at 13.7 inches, while Milwaukee was hit by 10.4 inches, breaking a century-old record of 9 inches set in 1915. New York City and New Jersey were getting rain and ice Monday, while areas to the North, all the way up to Maine, could expect snow throughout the day. Read more in WEATHER.

2. Cancellations and delays rack up

Going somewhere this morning? NBC News has commuters covered with live updates on route changes, traffic delays and transportation cancellations. The latest: More than 2,300 flights have been canceled at U.S. airports Monday, according to FlightAware. Chicago O'Hare, Newark, Boston and New York La Guardia are among the worst affected. Read more in WEATHER.

3. New England Patriots win fourth title in Super Bowl XLIX

The New England Patriots beat the Seattle Seahawks 28-24 after a nail-biting comeback in the fourth quarter from a 10-point deficit. The win is the team's fourth Super Bowl victory in the Tom Brady-Bill Belichick era, and resulted in Brady's third MVP title. Lenny Kravitz and Missy Elliott joined Katy Perry during her halftime show, which some loved and some thought was just plain weird. But now that all the fun is over, the league must confront the controversies that plagued it throughout the season, including its handling of domestic violence cases, concussions and the Deflate-Gate investigation. Read more in SPORTS.

4. Whitney Houston’s daughter in hospital after tub scare

Bobbi Kristina Brown, 21, was found unresponsive in a bathtub in her Georgia home on Saturday. She was brought to a Georgia hospital, where her father, R&B singer Bobby Brown, was by her bedside Sunday, according to a family spokesman. Brown asked for privacy for his family. The scare comes nearly three years after Houston, a seven-time Grammy winner, was found submerged in a bathtub in a Beverly Hills, California, hotel on Feb. 11, 2012. She was later pronounced dead. Read more in NEWS.

5. Obama: U.S. "deploying all the assets" to find ISIS prisoner

President Barack Obama told TODAY’s Savannah Guthrie in an exclusive interview that the U.S. is "deploying all the assets" possible to identify the location of an American woman being held prisoner by ISIS. The conversation comes after ISIS claimed to behead a Japanese journalist, Kenji Goto, after beheading another Japanese captive, Haruna Yukawa. "He was not just my loving husband and father to our two beautiful children, but a son, brother and friend to many around the world," Goto's wife, Rinko, said in a statement Saturday. Watch more on TODAY.

6. Nationwide defends bummer Super Bowl ad

No question about it: Many of last night's commercials were designed to tug at the heartstrings, from doting dads to darling doggies. But there was one that tugged a little too hard. Nationwide aired an ad with a little boy talking about what he won't be able to do in life ... because he's dead. The commercial was meant to educate people about preventable injuries in the home, which "are the leading cause of childhood deaths in America," Nationwide said in a statement. "The sole purpose of this message was to start a conversation, not sell insurance," Nationwide said. Read more in NEWS.

And now this ...

MIT researchers have created a camera that picks up vibrations that people can't see. The visuals are cool, but the camera's applications are even cooler, like monitoring a baby's breathing from far away. Check out what else the motion microscope can do: