A frontpage overview of the news from The Wall Street Journal, USA Today, The New York Times, The Washington Post, and Los Angeles Times for April 21.

A primary focus is the retirement of Apple CEO Tim Cook, who will be replaced by hardware veteran John Ternus as the tech giant navigates the artificial intelligence era. Meanwhile, the Trump administration faces complex challenges, including a high-stakes conflict with Iran, a Supreme Court-mandated $166 billion tariff refund, and the resignation of Labor Secretary Lori Chavez-DeRemer. International reports highlight fragile peace negotiations in Pakistan and a youth-led political shift in Nepal. Domestically, the news is marred by a tragic mass shooting in Louisiana and growing concerns regarding inflation and housing costs in Florida. Additionally, the sources touch on evolving technologies, such as Tesla’s self-driving controversies and privacy debates surrounding AI-integrated smart glasses.