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By Jamie Ross and Hannah Jewell Listen to this briefing Good morning. It’s Friday, Feb. 14. Happy Valentine’s Day! It turns out men may be more romantic than women — at least that’s what these experts say. Now let’s get to the news. President Donald Trump’s administration fired thousands of federal workers. The latest: Agency heads were told yesterday to terminate most trial and probationary staff. Meanwhile, Elon Musk’s team is ripping through the Education Department. Who is working for Musk? The Post is tracking members of his unusual team here. In other news: A $400 million contract was changed to remove a mention of Musk’s Tesla. And shows are dropping from the Kennedy Center’s calendar after Trump’s takeover. Read this story          Robert F. Kennedy Jr. was confirmed as Trump’s health secretary. President Donald Trump congratulates Robert F. Kennedy Jr. moments after he was sworn in as Health and Human Services secretary. (Jabin Botsford/The Washington Post) What to know: The anti-vaccine activist will oversee a nearly $2 trillion health portfolio. The Senate confirmed Kennedy yesterday — see how your lawmaker voted here. Digging deeper: Mitch McConnell was insulted by Trump after voting against Kennedy’s confirmation. Separately, education pick Linda McMahon defended Trump’s divisive plans. Read this story          Ukraine and European allies are alarmed by the Trump administration’s moves. Like what? Trump’s call with Russia’s president, and Defense Secretary Pete Hegseth’s remark that Ukraine’s peace goals were “unrealistic” — which he has tried to walk back. What else to know: Hegseth invited a far-right activist on a trip to Europe this week. And Ukraine said a Russian drone hit a containment structure at the Chernobyl nuclear plant. Read this story          Helicopter pilots could have mixed up jets in the D.C. crash, a 3D analysis shows. A still from a 3D model created by The Washington Post. On Jan. 29: An Army Black Hawk helicopter collided with a passenger jet over the Potomac River, killing all 67 people on both aircraft. The causes remain under investigation. What’s new? The Post re-created the view the crew probably had inside the helicopter — find it here. The analysis suggests that two planes appeared nearly aligned to the Army pilots. Read this story          There is more evidence of bird flu spreading to people. The details: Some veterinarians who provide care for cattle were unknowingly infected with H5N1 avian influenza last year, according to a CDC report published yesterday. Why it matters: The report — delayed for weeks by Trump’s pause on health communications — suggests bird flu is spreading undetected in cows and people. Another concern: At least 22 children and two adults were infected in a Texas measles outbreak. U.S. vaccination rates for the disease are falling. Read this story          Dangerously cold air is about to surge across the country. The lowest expected temperature from today to March 1. Data source: ECMWF. (Ben Noll/The Washington Post) In the coming days: A storm will bring snow or ice to about a dozen states. Next week, some 100 million people will be hit by subzero temperatures — these six graphics tell the story. Other climate news: Strong tornadoes are possible in the South this weekend. And scientists have a new explanation for the last two years of record heat. Read this story