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

From a stowaway's exceptional flight to tight security in Boston, see the stories we're following.
Image: Boston Prepares For First Running Of Marathon After 2013 Terror Bombings
A Boston police officer stands guard near the finish line of the Boston Marathon. The race kicks off this morning with 36,000 runners in the field.Andrew Burton / Getty Images

Good morning, and happy Monday. Here are some of the stories we're following today:

1. Security tight for marathon day in Boston

The Boston Marathon will be monitored by 100 cameras and 3,500 police officers — double the number of last year — as the city tries to conquer memories of last year's attacks. Forty checkpoints will surround the path of the race and 36,000 runners will take part — 5,000 those people who didn't get the chance to cross the finish line last year. Read more in NEWS.

2. Stowaway survives five-hour flight in plane’s wheel well

The 16-year-old made it from California to Hawaii in the wheel well of a Hawaiian Airlines plane, surviving frigid temperatures and an altitude of 38,000 feet. The FBI said the boy was likely unconscious during the flight but he was in good medical condition after the plane landed. His only possession: A comb for his hair. Read more in NEWS.

3. Korean ferry captain and crew accused of ‘murderous behavior’

"What the captain and part of the crew did is unfathomable from the viewpoint of common sense, unforgivable, murderous behavior," South Korea's president said. The ship's captain and two crew members were arrested Friday, and four more crew members were detained Monday. Transcripts released Sunday indicated confusion during the half hour the captain waited to evacuate the boat after it began listing. Sixty-four people are confirmed dead and 240 — many of them high school students — are still missing. Read more in NEWS.

4. Robo-sub comes up with no sign of jet again

The U.S. Navy-owned Bluefin-21 has completed mapping two-thirds of the search area that was designated due to "pings" thought to be from the missing Malaysia Airlines jet's black box. A ninth sub mission is planned for Monday, while 10 military aircraft and 11 ships also scour the area trying to solve the mystery of what happened to MH370 and the 239 people on board. Read more in NEWS.

5. Search ends for remaining missing Everest avalanche victims

Three out of the 13 Sherpas killed in the avalanche on Mount Everest on Friday have not been found, and after helicopters and crews scoured the mountain, the search for their remains was called off. Meanwhile, several Sherpa guides have called for the mountain to be closed to expeditions during the climbing season, which runs through May, as a mark of respect for the dead. Read more in NEWS.

6. 96,000 pounds of Oscar Meyer hot dogs recalled

Surprise! Thousands of dogs labelled "Classic Wieners Made with Turkey & Chicken, Pork Added" have something extra added — cheese. Cheese is a known allergen, and Kraft Foods notified the USDA on Saturday to disclose the error and recall the unintentional cheese dogs. Read more in NEWS.

… What’s trending today?

For anyone who's ever sat through a graduation ceremony, the decision at Bryant University not to allow selfies when the students accept their diplomas is probably a welcome one. The school's president, Ronald Machtley, said the move by the graduation committee was to deter him from taking selfies, not just the graduates. “I tweet a lot, I have 2,200 followers on campus and I think the fear was … because I take a lot of selfies throughout the school year that it would become an epidemic,” Machtley said.