On a recent episode of his podcast “Unconfuse Me,” Bill Gates said that his first question to a time traveler from the year 2100 would not be about personal or financial interests but rather on the state of humanity. During the podcast, the Microsoft co-founder told Hannah Ritchie, a data scientist from the University of Oxford and author of “Not the End of the World,” that he would ask whether humans are thriving. “In the end, it’s all measured through human welfare,” he said. During their conversation, Gates asked for Ritchie’s input on questions to pose to a time traveler. In her response, …