Adam Bryant interviewed 70 chief executives and other leaders for a book. He found that all of their traits were not genetic, but developed over the course of their career:These C.E.O.’s offered myriad lessons and insights on the art of managing and leading, but they all shared five qualities: Passionate curiosity. Battle-hardened confidence. Team smarts. A simple mind-set. Fearlessness.Read one of the most-read NYT articles of the week. It's adapted from the upcoming book. (Thanks, Claire)