You know that friend who seems quiet in groups but becomes a total chatterbox when you’re one-on-one? Or the person who’s always the life of the party but gets weirdly focused when they’re working ...

Author Susan Cain, a self-described introvert, accepted an invitation to do what she feared — give a TED talk. Although she was anxious on the big day, she got through it and wowed the audience.

All the bold ideas, inventions and perspectives of the beloved TED Talks conference and video series, plus special follow-up interviews with the people behind them.

Usually the hang is glorious. But sometimes, the energy is off. I've never confronted my extroverted friends about this. So it was validating to hear from Jennifer Kahnweiler, author of The ...