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By Jamie Ross and Hannah Jewell Listen to this briefing Good morning. It’s Friday, March 21, and if you’re reeling from the “Severance” season finale, the show’s creator explained it here. (Spoilers, obviously.) Now let’s get to the news. London’s Heathrow Airport was shut down, upending global travel. What happened? The airport lost power because of a fire at an electrical substation and will be closed until at least tomorrow. More than 1,300 flights will be directly affected. The wider impact: The closure at one of the world’s busiest airports is expected to cause disruption around the globe. Airlines are scrambling to divert passengers. Read this story          Elon Musk is set to visit the Pentagon to discuss his overhauls and China. What to know: The meeting will bring the Tesla CEO closer to secretive work, deepening his conflicts of interest. This week, the commerce secretary urged people to buy Tesla stock. In other Musk news: A judge blocked his U.S. DOGE Service from accessing sensitive Social Security data. And he keeps talking about racial issues — that wasn’t always the case. One more thing: Musk’s chatbot Grok has some fact checks for him. Read this story          The White House is scrambling after the JFK files exposed Social Security numbers. The details: The unredacted files on President John F. Kennedy’s assassination revealed CIA secrets (listed here) and personal data. Officials are trying to mitigate the harm. In other administration news: A top spokesman was sidelined after aggressively defending the Pentagon’s purge of content about the military contributions of minority people. Read this story          A judge accused the Trump administration of evading questions on deportations. The details: The judge said information provided about whether the administration disobeyed his ruling blocking some deportations was “woefully insufficient.” What else to know: The public is in favor of President Donald Trump’s migrant roundups, polls show. And a judge blocked the deportation of a Georgetown University researcher. Visiting the U.S.? Here are your rights at airports and border crossings. Read this story          Israeli troops entered northern Gaza, expanding ground operations. Yesterday: At least 85 Palestinians were killed, Gaza authorities said. Hamas fired back with rockets, injuring no one, for the first time since Israel broke a ceasefire this week. What next? Israel’s resumed invasion of Gaza threatens a return to all-out war. Families of hostages remaining in Gaza fear that time is running out for their loved ones. Read this story          The loneliest places in America tend to be in the Sun Belt. How often U.S. adults said they feel lonely. Note: “Sometimes” data was left off this graphic. Source: Census Bureau’s 2024 Household Pulse Survey. (Department of Data/The Washington Post) How we know: In 2024, the Census Bureau asked more than half a million people how often they felt lonely. Mississippi, Louisiana and Georgia led the pack — dig into the data here. Why? Extreme loneliness tends to be higher in states with higher poverty rates. Being lonely can pose threats to your health, although choosing to be alone can help to lift your mood. Read this story          ADVERTISEMENT   Scientists found something amazing after an iceberg broke off Antarctica. In January: An iceberg about 19 miles long cracked off the ice sheet, revealing a patch of ocean that hadn’t seen daylight in decades. Researchers decided to search the seafloor. What they found: An incredible array of potentially new species, including giant sea spiders, octopuses and corals. Find photos of the unusual critters here.   Read this story          Before you go … what to watch this weekend: The controversial “Snow White” is in theaters — here’s why it has made headlines. Plus: Netflix has a charming new whodunit. One more good read: Summer is coming for national parks. Will there be enough workers? And finally … end your week by playing On the Record, The Post’s quotable quiz. The weekend version is 10 questions, and you can risk all your points on a final bonus question. Ready to play? Click here. Or try our word games, Keyword and Wridges.