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

From a plane part being confirmed as a piece of missing MH370 to the highly anticipated GOP debate, see the stories we're following today.
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Good morning. Here are some of the stories we're following today:

1. Another Plane Piece Could be Part of MH370 Puzzle

More aircraft debris, including a plane window, has been collected from the tiny island of Reunion, Malaysian officials said Thursday. The finding comes after Malaysian authorities said a wing fragment discovered on the same island was from Malaysia Airlines Flight MH370. But those same authorities have been criticized for jumping the gun on confirmation — and accused of trying to tie a neat bow on an otherwise complicated investigation. Read more in NEWS.

2. GOP Candidates Gear Up for First Primary Debate

The number of candidates competing for the Republican nomination has grown so large that debate organizers decided to split the field into two groups: the top 10 and the bottom seven. The first group will take the stage in Cleveland at 5 p.m. ET, while the top tier, which will include Donald Trump, Jeb Bush and Scott Walker, goes on at 9 p.m. ET. Read more in POLITICS.

3. Tennessee Theater Attacker May Have Been Schizophrenic

Metropolitan Nashville police will try to learn more about what may have motivated Vincente David Montano, 29, to carry out the attack on Wednesday afternoon. No one was killed before Montano was fatally shot by police. According to his mother, he had been diagnosed with paranoid schizophrenia in 2006. Read more in NEWS.

4. Obama: Iran Debate Is Most Important Since Iraq War

President Barack Obama said Wednesday that rejecting his administration's nuclear deal with Iran would be a historic mistake — and he called it the most important foreign policy debate since the invasion of Iraq. Read more in POLITICS.

5. Bill Cosby Ordered to Give Deposition in Lawsuit

A judge ruled this week that the embattled comedian must answer questions under oath in October in a lawsuit brought by a woman who accuses Cosby of sexually assaulting her at the Playboy Mansion in the 1970s, when she was 15 years old. Read more in NEWS.

6. Dashcam Video Shows Shooting of College Football Player

The video released in court Wednesday shows the moment off screen when a North Carolina cop fatally shot former Florida A&M University football player Jonathan Ferrell in September 2013. The officer, Randal Kerrick, is on trial on charges of voluntary manslaughter for the controversial killing. Read more in NEWS.

7. George W. Bush Surprises at Dallas Jury Duty

The former president spent a few hours fulfilling his civic duty on Wednesday — and taking photos with a group of surprised potential jurors in Dallas while Secret Service agents kept watch. But in the end, Bush didn't get picked to sit on a jury. Read more in NEWS.

Nightly Spotlight

Lucas Hobbs, 12, commandeered a fleet of food trucks to feed as many doctors, patients and staff as he could to thank the hospital he credits with saving his life.