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KNOW IT ALL: Tuesday's Top Stories at NBC News

Following the nation's first 2016 primaries, and other stories we're following today.

Good morning. Here are some of the headlines we're following this morning:

1. All Eyes on New Hampshire

History doesn't always repeat itself, but a look back at the makeup of the electorate in New Hampshire during the past two election cycles gives a glimpse at how these notoriously hard-to-predict voters have made their decisions about whom to support in the high-stakes primaries. Take a look at how New Hampshire might vote tonight, and follow along with NBC News during the nation's first 2016 primary. Read more in POLITICS.

2. Train Collision in Germany Leaves at Least Eight Dead

At least eight people were killed and 150 injured when two commuter trains collided in southern Germany early Thursday, officials said. At least 50 of the injuries were "serious," according to police. The cause of the collision was not immediately clear. Read more in NEWS.

3. U.S. Olympic Committee Denies It Advised Athletes to Skip 2016 Games

The U.S. Olympic Committee strongly denied a Reuters report that said it advised athletes and staff to consider skipping the Summer Olympic Games in Brazil because of the Zika virus. The IOC statement echoed remarks made last week by the Olympic organizers' medical director, Dr. Joao Grangeiro, in which he said: "Athletes should come to the Olympic Games ... They are not at risk." Read more in HEALTH.

4. Trump Shocks With Vulgar Language at New Hampshire Rally

Speaking to about 5,000 people at Manchester's Verizon Center on the eve of the New Hampshire primary, Trump railed against opponents who criticize against his tone. When a woman in the crowd allegedly called one of those opponents an epithet for female anatomy, Trump said: "She just said a terrible thing. You know what she said? Shout it out 'cause I don't wanna." Then he said it anyway: "She said, 'He's a p---y.'" Read more in NEWS.

5. ISIS Leader's Widow Charged in Kayla Mueller's Kidnapping

Nisreen Assad Ibrahim Bahar, also known as Umm Sayyaf, was accused Monday of taking part in the abduction of Kayla Jean Mueller, the humanitarian aid worker from Arizona who was kidnapped in Syria in 2013 and died last year. The Justice Department said the 25-year-old is in Iraqi custody for terrorism-related activities. Read more in NEWS.

6. Michigan Board Approves Petition to Recall Gov. Rick Snyder

A Michigan state board has approved circulation of a petition to recall Michigan Gov. Rick Snyder — but not over the water crisis in Flint. Instead, the petition approved Monday seeks to remove Snyder, a Republican, from office over his decision last year to take control of the state office to reform schools, which organizers say disregards local prerogatives. Read more in NEWS.

7. Celebs #StandWithWaris After Designer Barred From Flight

Advocates and celebrities are rallying behind Sikh actor and designer Waris Ahluwalia after he was stopped from boarding a New York-bound flight Monday because he was wearing a turban. Ahluwalia was returning to New York fashion week Monday from New Mexico when said he was turned away from the Aeromexico flight. Read more in NEWS.

Nightly Spotlight: The 2016 Race Through the Eyes of a Stuffed Dino

One man’s non-partisan pursuit of snapping photos of presidential hopefuls has turned his favorite childhood cartoon into a popular campaign correspondent.