Were you the favorite child, the wild child or the middle child? Jeffrey Kluger explores the profound life-long bond between brothers and sisters, and the influence of birth order, favoritism and sibling rivalry.

There is a hidden slipperiness to the words simple and complex — not because their meanings aren't manifestly clear. They are. It's because they're so often manifestly wrong too. Jobs that we think of as relatively simple are actually dizzyingly complex. All across disciplines—business, politics, language, global health, food, the arts—simplexit...