The last time we went to the zoo, we stood shoulder to shoulder along the fence of the elephant enclosure, waiting for an educational presentation to begin. At the advertised hour, a young man dressed in khaki shorts and shirt, holding a mic, strode into the open space in front of us. He treated us to a huge zoo-welcoming smile and shouted, “I’m Noah! I’m your host for today’s elephant talk!” And then he gave a slick word-perfect lecture that…