Ukrainian forces holed up at a steel plant in the besieged port city of Mariupol have ignored a “surrender or die” ultimatum from Russian forces and continue to fight. Meanwhile, new cyberattacks targeting the Ukrainian electrical grid indicate a new phase in the digital war between Russia and Ukraine. Plus, some foods — like Champagne — can come only from one region, but for others, the rules aren't so clear. Just ask cheesemakers all over the globe who say they are also making Gruyère.