Do you pay attention to your attention? John Green is the beloved author of The Fault In Our Stars, and when he started tracking his attention, he realized he was obsessed with evaluating human progress. He decided to start rating everything—from the capacity for human wonder to Canadian geese—on a five-point scale. In this deeply thoughtful conversation with Adam, John shares what he learned from his series of Yelp-style reviews, the gift of a great book, and the unexpected life lessons found in the last lap of Mario Kart. Read the full text transcript at go.ted.com/T4G8