If after watching Netflix’s Tiger King, you’re still scratching your head wondering why more of the on-camera subjects aren’t under investigation, let this exclusive clip from a new documentary about one of the world’s most renowned conservationists be a palate cleanser. The two-hour special Jane Goodall: The Hope is part of National Geographic’s Earth Day (April 22) programming, and picks up where like Brett Morgen’s Jane left off to explore Dr. Goodall’s legacy after decades of wildlife conservation and animal advocacy. In this exclusive clip, Dr. Goodall’s pioneering work in the field of biology is lauded by contemporary scientists, as well as her message of hope: “Most scientists don’t talk about hope, and yet Jane does. Jane gives that human side to the rigorous science.”