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

From new details in the San Bernardino shooting to more tragedy for Syrian refugees trying to reach Europe, here are the stories we're following.

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

1. Flood of Muslims in America is Mostly a Mirage: Poll

Donald Trump might be tapping into Americans' wariness with his call to stop all Muslims from coming into the U.S., a new poll finds — but the flood of Islamic immigrants is a mirage. Not one predominantly Muslim nation makes the list of top 10 countries of origin for legal immigrants in 2013, according to the Migration Policy Institute. Read more in NEWS.

2. Shooter Got Cold Feet Before 2012 Attack: Sources

Syed Rizwan Farook, one of the shooters who killed 14 people last week at a social services agency in California, was discussing staging a terrorist attack in the Los Angeles area with a neighbor as early as 2012 — but got cold feet, investigators said Wednesday. Read more in NEWS.

3. Muhammad Ali Jabs Trump Over Muslim Ban

The Greatest took shots Wednesday at "so called Islamic Jihadists" and those who would "use Islam to advance their own personal agenda." While Ali never mentioned Donald Trump by name, his comments come amid the outrage over the GOP front-runner's proposal to ban Muslims from entering the U.S. Read more in NEWS.

4. Syrian Whose 7 Kids, Wife Drowned: 'Don't Take This Risk'

Ali Alsaho, whose wife and seven kids drowned while fleeing ISIS and Syria's civil war, is warning others in his position against making similar attempts to reach Europe. "Don't take this risk, don't go by sea — you will lose your children," he told the BBC. Read more in NEWS.

5. North Korea Has Hydrogen Bomb, Kim Jong Un Claims

The North Korean despot has claimed his country has developed a hydrogen bomb, a significant step forward from the less powerful atomic bomb. But experts and neighbors were reacting to the announcement with caution. Read more in NEWS.

6. Brother’s Suicide Confession Frees Man After 15 Years

Floyd Bledsoe, a Kansas man who spent 15 years in prison for the murder of his 14-year-old sister-in-law, is now free after his brother confessed to the brutal rape and killing in a suicide note last month. Read more in NEWS.

7. Pineapple Pesticide Linked to Parkinson's Disease

A pineapple pesticide that made its way into milk in Hawaii also made its way into men's brains, and those men were more likely to develop Parkinson's disease, a new study finds. Read more in HEALTH.

Nightly Spotlight

They're the season's hottest gift. Hoverboards have caused at least six serious fires nationwide due to what critics say are cheap lithium batteries that overheat.