This lecture discusses human diversity and challenges the idea that biological race exists or is a valid way to categorize humans. It explains that while people can be classified based on biological traits like skin color or blood type, these traits do not "cohere" enough between or within populations to define distinct races. The lecture discusses evidence that humans migrated out of Africa along multiple routes starting over 50,000 years ago, and that biological changes in humans have been minor for the past 50,000 years while cultural changes have diversified human groups. The key point is that all living humans have the same innate capacity for developing culture, so human differences are best understood as cultural rather than racial.