Jeff [Bezos] didn’t come down from the mountaintop with these leadership principles carved in stone,” said longtime employee Doug Herrington.

Initially inspired by anime and manga, Wang enrolled in first-year Japanese. In the two years since, though, her path to fluency has been far from straightforward.

Interbrain synchrony is the simultaneous activity of neural networks across the brains of people who are socially interacting—for example, talking, learning, singing, or working together. Having ...