At the 91st Academy Awards ceremony in Los Angeles on Feb. 24, a curious thing happened. As dozens and dozens of actors and directors climbed the stairs to receive an Oscar, one of the people on stage accepting an award that night was not an actor or a director or anyone involved in filmmaking at all.He was a rock climber.Alex Honnold, a lanky and athletic 33-year-old California native, appeared on the Academy Award stage …