Today was the second time I filmed Dr. Jane Goodall recently for an upcoming movie, and each time she has taken me off guard (in a good way) with an extraordinarily gentle spirit, iron resolve, and tendency to break into impromptu primate calls.

Dr. Goodall is 77 years old. She moves lightly; the years exert no visible weight on her. She talks in a whisper, not out of reserve or infirmity, but from the quiet confidence of somebody accustomed to her own authority and eloquence. People listen.

This morning, Dr. Goodall speaks with the crew at the International Space Station. Commander Mike Fossum and Flight Engineer Satoshi Furukawa join in. I film her side of it. The astronauts are inspired by Dr. Goodall’s life-long conservation mission. She finds common ground, learning about their science and their thoughts about the Earth from their perch.

In orbit, the world’s most accomplished astronauts are zipping at more than 17,000 miles per hour, chatting with the only person who’s ever been accepted into chimpanzee society. As I type this, Jeff Orlowski is putting the final touches on Jane Goodall: Live, which is playing one night only, September 27, in 500 cinemas around the country. Afterwards, Dr. Goodall and I discuss Roots and Shoots, a youth-oriented program of the Jane Goodall Institute that is in 100+ countries and all 50 states. It’s her passion; it’s visceral how intent she is on getting the next generation to care. She leans in: “I bet you need a chimp hug,” she says. I mutter something far less poignant than how David Graybeard might have responded. She utters a chimp call, and tenderly squeezes. I smile.