Think Again makes the subversive claim that in a fast‑moving world, the advantage isn’t what you know, it’s how quickly you can rethink it.

Adam Grant contrasts three familiar ruts—the preacher defending doctrine, the prosecutor proving a point, and the politician chasing approval—with the scientist’s habit of testing, poking holes, and updating. The engine is confident humility; hold strong views lightly, and change them gladly. Grant translates research into practice. He shows how using motivational interviewing can open closed minds, that to “complexify” issues can puncture polarisation, and building psychological safety leads to teams being able to surface errors early.

He shows how to separate identity from ideas, turn friction into curiosity, and design workplaces that reward learning over being right. This matters because certainty feels safe but ages fast. If you lead, teach, or simply want to be less wrong tomorrow, this is a manual for staying adaptable.