Today on The Sterling Report: El Niño may be returning, Britain’s oldest known rock art emerges from a Welsh cave, Uber’s lost-and-found box tells on America, and NASA explains the boom that shook parts of New England. Plus, a Long Island village has no mayoral candidates, America prepares for its 250th birthday, a Missouri man finds a $50,000 lottery ticket in his truck, and a Sydney concert is saved by a pianist from the audience.