evidence: A U.S. fighter jet shot down a high-flying object above Lake Huron Sunday after it flew near a sensitive military site, the Pentagon said. The shoot-down, which came on President Joe Biden’s order, is the latest in an unusual series of aerial incidents that began last week when a suspected Chinese spy balloon traversed the continental United States. [...] Up until a week ago, the U.S. had never shot down an airborne object in North American airspace that was deemed to be a threat. Now the extraordinary has come to seem commonplace. On Feb. 4, the U.S. blasted apart the mammoth Chinese balloon over the Atlantic Ocean. On Feb. 10, on Friday, an American fighter jet shot down a small car-sized "object" off the Alaskan coast. The next day a fighter brought down another "object" over northern Canada.