Join Blue Hill Heritage Trust as we present guest speaker Tom Wessels on June 21st 7pm. The organizing principle that has allowed life to exist on this planet for 3.8 billion years is co-evolution—a process that creates an incredibly complex web of mutually beneficial relationships. This talk will explore how co-evolution works, using lots of examples that occur in nature, as a model for creating human systems that not only sustain themselves, but thrive as well. Open to the public at Emlen Hall, Bay School.