Organized by Jane Pauley. In our cover history, Mo Rocca marks the 250th anniversary of the battles of Lexington and Concord, which launched the United States War of Independence. Also: Ted’s couple analyzes the dangers raised by the cuts of Trump’s administrations in foreign aid; Martha Teichner sits with David Hyde Pierce, starring Broadway in “Pirates! The Penzance musical”; Robert Costa Explore The recently renewed Museum of the Frick collection in New York City; Faith Sage talks to the producers of writers Amy Sherman-Palladino and Dan Palladino about his new ballet series, “Étoile”; Allison Aubrey reviews a new Senior Model Center in Los Angeles; Seth Doane learns the secret of chocolate Easter eggs in the Cadbury factory in England; And Conor Knighton discovers how hat fashions at the end of the 19th century led to a conservation movement to protect birds.