NPR News Now covers new 50% U.S. tariffs on Canadian goods following failed trade talks, prompting reciprocal measures from Canada. The White House considers renaming a Navy carrier from Doris Miller to Donald Trump, drawing criticism. Vice President JD Vance promotes a steel plant investment in Ohio as evidence of manufacturing retention. Additionally, the episode reports on WWII explosives unearthed by European wildfires, the upcoming launch of NASA’s Roman Space Telescope, and a Chinese robot breaking Usain Bolt’s 100-meter sprint record.