Tim Cook used part of his address to graduating students at Massachusetts Institute of Technology on Friday to poke fun at President Donald Trump.

The Apple CEO began by saying he’d never figured out how students at the university in Cambridge pulled off their spectacular course-end pranks ― such as the placing of a propeller atop the campus’ Great Dome.

“Or how you’ve obviously taken over the president’s Twitter account,” Cook added. “I can tell college students are behind it because most of the tweets happen at 3 a.m.”

Cook went on to deliver some serious advice to the class of 2017, and the effect that the online world may have on their lives.

“The internet has enabled so much and empowered so many. But it can also be a place where the basic rules of decency are suspended and pettiness and negativity thrive,” Cook said.

He encouraged students not to let “the noise knock you off course” or to “get caught up on the trivial aspects of life.”

“Don’t listen to the trolls, and for God’s sake don’t become one,” Cook added. “Measure your impact on humanity not in likes, but in the lives you touch. Not in popularity, but in the people you serve.”

Watch Cook’s full speech in the clip below:

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The trailer for “Black Panther” has finally arrived and, by the looks of it, this Marvel world will take us on one helluva ride.

In the nearly two-minute teaser, Chadwick Boseman reprises his role as T’Challa (aka the Black Panther) and returns home as king of Wakanda ― a mysterious, powerful and vividly colorful African world. There, we meet a star-studded cast with Lupita Nyong’o as Nakia, Danai Gurira as Okoye and, T’Challa’s nemesis, Erik Killmonger, played by Michael B. Jordan.

The teaser, which dropped during Game 4 of the NBA finals, opens with Klaw (played by Andy Serkis) chained to a chair asking Everett K. Ross (Martin Freeman) what he knows about Wakanda. When Ross says that it’s a third world country with “cool outfits,” Klaw reveals Wakanda’s true secret, claiming that he is the only person to have ever seen the country and make it out alive. 

“Explorers have searched for it, called it El Dorado,” Klaw growls. “They looked for it in South America, but it was in Africa the whole time.”

Wakanta, as it appears in the trailer, is a mix of traditional and modern, natural and sleek, and is brimming with waterfalls. Its people are as Ross had suggested — ornate and vibrantly dressed — but they also prove to be as fierce as T’Challa himself.

And, of course, a generous amount of time was used to show the Black Panther’s own super-hero strength and impenetrable armor.

While the trailer is packed with action and fantasy, Boseman’s co-star Sterling K. Brown has said that the film raises “really provocative questions” and is “politically astute” and “socially relevant.” 

“It’s not just an action film,” Brown told Entertainment Tonight. “It addresses the climate today of Africans and African-Americans ― across the country and across the world ― in a way that people will really be excited about.”

“Black Panther,” directed by Ryan Coogler and based on the comic book series by Ta-Nehisi Coates, premieres in theaters in February 2018.

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