My husband — a brooding New Yorker, polite and tolerant of much — broke on the seventh day of our family vacation. “She doesn't stop talking,” he said. The "she" is my mother — a bubbly Midwesterner — ...

All of which suggests that people really like to be led by extroverts. But according to fascinating new Harvard research, things aren’t so simple. Extroverts may be valued at work, but it turns out ...