Did You Learn Anything in the PhD?

After a few years at Gombe, you went to Cambridge to get a PhD. Despite the fact that you had never attended university, you didn't have a cause degree. Now, David Graebiard was one of your favorite chimpanzees. Can you describe how you and David became friends? Well, he was my mentor, really, because he began to lose his fear. And so gradually they began to relax and trust me.