5 things for February 28: Florida shooting, White House, teacher strike, Apple

Officials: Gunman stopped with 180 rounds left
Officials: Gunman stopped with 180 rounds left

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    Officials: Gunman stopped with 180 rounds left

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Officials: Gunman stopped with 180 rounds left 01:32

(CNN)How do you prep for a mission to Mars? Head to Oman, on the Arabian Peninsula, of course. Here's what else you need to know to Get Up to Speed and Out the Door. (You can also get "5 Things You Need to Know Today" delivered to your inbox daily. Sign up here.)

1. Florida high school shooting

They're headed back to school, and our hearts go with them. The students at Marjory Stoneman Douglas High School resume classes today, just two weeks after a gunman massacred 17 of their classmates and teachers. It'll be a short day, just four hours, as the teens try their best to get back to normal routines. But, of course, nothing will ever really be the same. At the school today, there will be grief counselors, comfort dogs, "MSD Strong" shirts -- and flowers on empty desks.
    The surviving students' push for gun reform -- the #NeverAgain movement -- may be running up against tough headwinds in Congress, but it's lit a spark in the nation's schools, where walkouts and protests are planned for next month. One of the effort's most notable figures may be Emma Gonzalez, of "We call BS" fame, who now has more Twitter followers than the NRA.
    Wounded student: I'm so grateful to be here
    Wounded student: I'm so grateful to be here

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      Wounded student: I'm so grateful to be here

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    Wounded student: I'm so grateful to be here 01:27

    2. Russia investigation

    Investigators for special counsel Robert Mueller have recently been asking witnesses about Donald Trump's business activities in Russia prior to the 2016 presidential campaign as he considered a run for president, according to three people familiar with the matter. The lines of inquiry indicate Mueller's team is reaching beyond the campaign to explore how the Russians might have sought to influence Trump at a time when he was discussing deals in Moscow and contemplating a presidential run.
    Meanwhile, back at the White House, the security clearance of Jared Kushner -- Trump's son-in-law and senior adviser -- has been downgraded. He now has a lesser "secret" clearance, which allows access to far fewer US government secrets. Word of this comes as the Washington Post reports officials from at least four countries discussed ways to use Kushner's business arrangements, lack of experience and financial troubles to manipulate him.
    WaPo: Officials from 4 countries discussed exploiting Kushner
    WaPo: Officials from 4 countries discussed exploiting Kushner

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      WaPo: Officials from 4 countries discussed exploiting Kushner

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    WaPo: Officials from 4 countries discussed exploiting Kushner 02:14
    If that all sounds like, well, a lot, it really is. CNN's Stephen Collinson says the wave of triple bombshells reveals this White House is at a pivotal moment.
    White House in damage control on major issues
    White House in damage control on major issues

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      White House in damage control on major issues

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    White House in damage control on major issues 02:51

    3. West Virginia teacher strike

    Students go back to school tomorrow in West Virginia, now that a deal has been reached amid a four-day strike. Gov. Jim Justice said teachers would get a 5% pay raise, if state lawmakers approve it. Work still needs to be done on insurance issues, though. Justice, a Republican, said it wasn't talks with teachers or their union that softened his position on the pay raises but a chat he had with a sixth-grader, who urged the governor to invest in education.
    West Virginia teachers strike for fourth day
    02 Why West Virginia teachers jorgensen

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      West Virginia teachers strike for fourth day

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    West Virginia teachers strike for fourth day 01:04

    4. Apple and China

    Apple is moving iCloud accounts registered in mainland China to state-run Chinese servers, along with the digital keys needed to unlock them. This has human rights groups and privacy advocates worried because Chinese authorities now have all the tools they need to access users' data. Apple made the move to comply with China's regulations on cloud services, and it highlights the trade-offs global companies make to do business in China.
    Skype pulled from app stores in China
    china skype pham pkg _00002016

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      Skype pulled from app stores in China

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    Skype pulled from app stores in China 01:32

    5. Climate change

    The North Pole is having itself a record-breaking winter, but not the kind you'd probably expect. Temperatures in the Arctic soared well above freezing this week, giving the region the hottest temps ever recorded there in winter. Stunned scientists say retreating sea ice and warming sea temperatures are the big contributors to the Arctic heat wave.
    Facts first: Climate change is real
    Facts first: Climate change is real

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      Facts first: Climate change is real

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    Facts first: Climate change is real 01:43

    TODAY'S QUOTES

    "It was a botched and bloody mess."
    Bernard Harcourt, attorney for an Alabama death row inmate whose execution by lethal injection was aborted after prison personnel had trouble finding a vein
    Lethal injection explained
    Lethal injection explained

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      Lethal injection explained

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    Lethal injection explained 01:27
    "I have to believe that some of them were able to elude us thanks to the mayor's irresponsible decision."
    ICE Deputy Director Thomas D. Homan, who says hundreds of undocumented immigrants with criminal records remain at large in Oakland, California, because Mayor Libby Schaaf gave a heads-up about ICE raids

    BREAKFAST BROWSE

    Out of the game
    Papa John's is cutting the NFL from its sponsorship lineup after a season in which it blamed player protests for slumping sales.
    Gutsy call
    A first responder at the Florida high school shooting disregarded an order but ended up saving a life.
    First responder speaks out on reviving Parkland teen
    First responder speaks out on reviving Parkland teen

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      First responder speaks out on reviving Parkland teen

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    First responder speaks out on reviving Parkland teen 01:17
    Equal opportunity drinking
    Move over, Johnnie Walker. Jane Walker wants her time on the famous whiskey brand's logo.
    Four billboards outside Palm Springs
    Serena Williams is one of the greatest athletes of all time. She's also the Greatest Mom Of All Time, according to billboards set up by her hubby in Cali.
    One of four billboards that Serena Williams' husband put up in Palm Springs.

    TODAY'S NUMBER

    11
    The number of people who fell ill after a suspicious letter was opened at Joint Base Fort Myer-Henderson Hall in Arlington, Virginia
    Suspicious letter arrives at military base
    Suspicious letter arrives at military base

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      Suspicious letter arrives at military base

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    Suspicious letter arrives at military base 01:12

    AND FINALLY

    Door drop
    Why is our stuff outside? This time it wasn't the cat. (Click to view.)