The episode "Why Do People Have Pets?" from the "Origin of Everything" series explores the historical context and evolutionary journey from livestock to companionship, focusing on animal domestication. It delves into the early domestication of Canis familiaris (dogs) from wolves around 15,000 years ago in Asia and their rise as man's best friends. Cats, on the other hand, may have domesticated themselves as natural survivors and pest controllers. The video examines cultural perceptions of animal intelligence and its impact on the differentiation between pets and livestock. Social and psychological factors like "baby schema" contribute to humans' attachment to pets. The pet industry began in the 1840s and has since evolved, driven by urbanization and changing societal norms. This engaging narrative weaves science, history, and human-animal relationships, providing valuable insights into the past and present of pet keeping.