5 Things to Know This Morning

— -- Your look at the five biggest and most buzz-worthy stories of the morning.

1. Mark Zuckerberg Reveals the One Question He Asks Before Hiring a New Facebook Employee

When Mark Zuckerberg is involved in bringing a new employee into Facebook, the CEO said the answer to one simple question helps him determine whether the person would be a good fit:

Would I be happy working for this person?

"I will only hire someone to work directly for me if I would work for that person," Zuckerberg told a group in Barcelona who participated in the Facebook co-founder's monthly town hall meeting. "It's a pretty good test."

2. Hillary Clinton Responds to Email Controversy

Hillary Clinton addressed concerns Wednesday about her use of a personal email account during her term as secretary of state, expressing a desire to release her emails.

“I want the public to see my email. I asked State to release them. They said they will review them for release as soon as possible,” Clinton wrote on Twitter.

3. US Ambassador Mark Lippert Attacked in South Korea

The U.S. ambassador to South Korea was listed in stable condition after he was attacked by a man with a knife in the country's capital while giving a speech, officials said.

Photos from South Korea's official news agency show Lippert with blood on his hand and holding his bleeding face. A man shouted "No to war training!" before attacking him, the Yonhap news agency reported.

4. Boston Marathon Bombing: Dzhokhar Tsarnaev’s Defense Admits ‘It Was Him’

The defense team for Dzhokhar Tsarnaev made a stunning admission at the beginning of the accused Boston Marathon bomber’s trial: “It was him.”

“We’re all going to come face to face with unbearable grief, loss and pain caused by a series of senseless, horribly misguided acts carried out by two brothers, 26-year-old Tamerlan Tsarnaev and his younger brother, 19-year-old Dzhokhar,” defense attorney Judy Clarke told the court. “We do not and will not at any point in this case sidestep or attempt to sidestep Dzhokhar’s responsibility for his actions. We think the question of ‘why’ is important.”

5. Adam Sandler and Bob Barker Recreated Their 'Happy Gilmore' Fight

Adam Sandler and Bob Barker are still fighting.

The duo – who hilariously brawled in the 1996 golf comedy “Happy Gilmore” – reprised their film rivalry for Comedy Central’s “Night of Too Many Stars,” recreating their infamous fighting scene, this time in a hospital room. “Night of Too Many Stars,” which airs Sunday, raises money for autism programs.

The scene opens with Barker in bed and Sandler sitting nearby, wearing his character’s usual Boston Bruins hockey jersey. The two trade insults.

“I’m fine. But you know, you are looking old. How old are you, 60?” Barker asks. “You’re looking chunkier than this soup … I guess doing all those movies without me took its toll.”