Juan Enriquez gave a speech called "Will our kids be a different species?" where he maintained audience attention with a comedic introduction before discussing whether humans are evolving over time. The document evaluates Enriquez's speech positively for providing information in an easy to understand way and lists tips for effective public speaking like customizing content to the audience and using humor. It also reflects on how Enriquez's use of jokes and pauses helped maintain understanding of complex topics.