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

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

1. Trump Fails to Correct Man’s False Obama Claim

Usually, it's what Donald Trump says that sparks controversy. But on Thursday night during a campaign rally in New Hampshire, it's what the GOP presidential candidate didn't say that's raising eyebrows. In front of about 3,000 people, Trump declined to correct a questioner who said President Barack Obama is a Muslim while also saying Muslims are a "problem" in America. Read more in POLITICS.

2. Are American Cities Prepared for Massive Tsunamis?

In Chile, more than a million people evacuated their homes this week in the wake of an 8.3-magnitude earthquake and tsunami alert, keeping the casualty count below a dozen. But in the U.S., there is no guarantee Americans are as prepared, and there is no federal standard on how to warn people. Read more in SCIENCE.

3. Federal Reserve Leaves Interest Rates Unchanged

The Fed declined to raise its benchmark federal funds rate on Thursday, saying that uncertainty abroad, volatility in financial markets and stubbornly low inflation persuaded members that the U.S. economy is not yet growing strongly enough to merit a light tap on the brakes. Read more in BUSINESS.

4. Croatia Shuts Border Crossings After Migrant Influx

Croatia closed all but one of its border crossings with neighboring Serbia Friday after struggling to cope with a huge influx of migrants and refugees. Officials said they had no choice after more than 11,000 people had entered the country since Hungary fenced off its border with Serbia earlier this week. Read more in NEWS.

5. Bill Cosby Accusers Share Stories of Assault

More than a dozen women who have accused the comedian of sexually assaulting or molesting them in the past shared their stories in a TV program that aired Thursday night on A&E, describing the alleged assaults in sometimes graphic terms. Cosby has denied such allegations and has never been charged. Read more in NEWS.

6. Ads Pulled After 'League' Actor Fesses Up to 9/11 Lie

Buffalo Wild Wings will stop airing commercials featuring Steve Rannazzisi, star of the popular FX TV show "The League," after the actor admitted to lying for years about escaping death during the Sept. 11, 2001, attacks. Read more in POP CULTURE.

7. ‘Invisibility Cloak’ Hides Things in Plain Sight

It sounds like something out of "Predator" or "Harry Potter," but researchers have built an ultrathin "invisibility cloak" that turns objects into perfectly flat mirrors. Read more in SCIENCE.

Nightly Spotlight

Marine Aaron Fleming's lifeline in Afghanistan was Sami — his Afghan translator who was later targeted by the Taliban for his work. Now, Fleming wants to help Sami.