Nightline anchor Dan Harris embarks on an unexpected, hilarious, and deeply skeptical odyssey through the strange worlds of spirituality and self-help, and discovers a way to get happier that is truly achievable. In his book 10% Happier, he joins the show to talk about how important meditation is for your health and happiness!

The characters of The Walking Dead live in a desolate post-apocalyptic world, filled with relentless violence and death. In reality, how would such never-ending stress and trauma affect the psyche? By understanding the psychological forces that drive the series' action, fans can better grasp Robert Kirkman's compelling fictional universe. Join us as we talk with Travis Langley about his book The Walking Dead Psychology.