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

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Good morning. Here are some of the stories we're following today:

1. Pope Meets Fidel Castro After Largest Papal Mass Ever

On his second day in Cuba on Sunday, Pope Francis swapped books with the country’s former leader Fidel Castro, Vatican spokesman Father Federico Lombardi said. On Tuesday, the pontiff will fly to the U.S. and finish his historic 10-day tour of the two countries. Read more in NEWS.

2. Ben Carson's Camp Responds to Outrage Over Islam Comments

A national Muslim civil liberties group has called for Carson to withdraw from the race after he told "Meet the Press" that he would not agree with having a Muslim in the White House. Carson campaign spokesman Doug Watts responded. "He did not say that a Muslim should be prevented from running, or barred from running in any way," Watts said. "(Carson) just doesn't believe the American people are ready for that." Read more in POLITICS.

3. Emmys Recap: 'Game of Thrones,' 'Veep,' Jon Hamm Win Big

While "Game of Thrones" won a record-breaking 12 Emmy Awards on Sunday night, perhaps the most memorable trophy was bestowed upon "Mad Men" star Jon Hamm, who finally won his elusive first Emmy with his 16th nomination. "There's been a terrible mistake, clearly; thank you for that," said Hamm. Read more at TODAY.

4. Fiorina Won Debate, but Trump Still Leads: NBC Survey

More than a third of Republican voters say that Carly Fiorina performed best in the Wednesday night debate on CNN. But debate performances don’t translate into vote preference overnight, and Donald Trump maintains his position at the top of the Republican pack, according to the latest NBC News online survey conducted by SurveyMonkey from Wednesday through Friday. Read more in POLITICS.

5. He's Back: Greece's Ex-Prime Minister Gets Second Chance

Alexis Tsipras' left-wing Syriza party battered opponents in a snap general election as Greeks gave the 41-year-old leader a second chance to deal with the country's staggering debt and carry out major reforms aimed at modernizing its government and economy. Read more in NEWS.

6. Olympic Coach Accused of Molestation Is Found Dead

The coach, Marvin Sharp, 49, was discovered just after 8 p.m. at the county jail where he was being held, Marion County Sheriff’s Office spokeswoman Katie Carlson said. Authorities believe he committed suicide, she said. Read more in NEWS.

7. Cyber 101: Why Hackers Are Going After Universities

These aren't college kids trying to change their grades. They're potentially "nation-state actors" much like the hackers who have targeted large corporations in the past, said Michael Oppenheim, intelligence operations manager at Internet security firm FireEye.