The place was heaving. The audience was a sell-out, maybe 3000-strong. Families, students, scientists and fans.
Everyone there had chosen to miss a dramatic Lions rugby test for an evening with an 83-year-old and a handful of photographic slides.
I sat in the bleachers by a bookish young teenager, who whipped out a paperback to pass the minutes in the intermission.
Jane Goodall was fantastic. The audience clung to her stories as she guided us through her incredible life.
She plotted how, from World War II London, she escaped Britain for the mighty forests of Tanzania and Congo. She told her audience about the defining moment of her scientific career: when she became the first person to witness a chimpanzee fashioning a tool in the wild.