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

Here's a look at this morning's key headlines.

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

1. Deadly Explosions Rock Airport, Subway in Brussels

At least two explosions rocked the check-in zone of Brussels Airport Tuesday, killing and wounding “several” people, while another blast shook a metro station in the Belgian capital. Read more in NEWS.

2. Blood & Panic: Witnesses Describe Brussels Blast Chaos

“Soon after that one a second one hit — and everything came down,” eyewitness Jef Versele told NBC News. “There was dust everywhere, glass everywhere there was chaos, there was people on the floor everywhere. The ceilings came down. It was quite a mess.” Read more in NEWS.

3. 20 Years and 13 Alibis Later, Murder Charge Thrown Out

Richard Rosario has spent two decades behind bars, insisting for every one of those years that 13 alibi witnesses could prove he was innocent of a 1996 New York City murder. On Tuesday, the Bronx District Attorney’s Office told NBC News it intends to ask a judge to throw out Rosario’s conviction. Read more at DATELINE.

4. Tense Raul Castro on 'Political Prisoners': Give Me Names!

One issue lingered like a 400-pound guerrilla during the historic appearance Monday by President Barack Obama and Cuban leader Raul Castro: What about the country's political prisoners? Read more in NEWS.

5. FBI Finds 'Possible' Way Into Terror Phone Without Apple

The Justice Department late Monday was granted a postponement of tomorrow's planned hearing in its lawsuit against Apple over an iPhone belonging to one of the San Bernardino attackers, Syed Farook. In asking for the delay, the government said it wants to try another way to get into the phone. Read more in TECH.

6. Ex-Benghazi Investigator Drops Claim of Anti-Clinton Bias

Air Force Reserve major Brad Podliska, a former investigator for the House Benghazi Committee, is dropping allegations that the committee unfairly targeted Hillary Clinton from his lawsuit against his former employer. Read more in NEWS.

7. Fewer in U.S. Believe in God, But More Believe in Afterlife

Fewer Americans say they believe in God or pray regularly — yet more people believe in an afterlife nonetheless, a new study finds. It’s a generational thing, with millennials the least likely generation to say they’re religious or to take the Bible literally, the team at San Diego State University, Florida Atlantic University and Case Western Reserve University found. Read more in HEALTH.

8. Intel Mastermind Andy Grove Dead at 79

Andy Grove, the Silicon Valley elder statesman who made Intel into the world's top chipmaker and helped usher in the personal computer age, died on Tuesday at age 79, Intel said. Read more in NEWS.