Ever have the sneaking suspicion that your friends are more popular than you? Turns out it’s probably true—and not just because you may be insufferable at cocktail parties. Why it’s true is fairly complicated, but in his book “The Human Network” Stanford economist Matthew O. Jackson entertainingly analyzes this and other mysteries. Drawing on the academic discipline known as network theory, Mr. Jackson aims to introduce and popularize a powerful way of understanding some of modern society’s central challenges. https://www.wsj.com/articles/the-human-network-review-like-goes-with-like-11554246534 The human network