After years of being mistaken for one another, Klein tried to find out why Wolf went down the conspiracy rabbit hole—and why so many people have followed her.

The “Beauty Myth” author has gone from being a feminist icon to an anti-vaxxer banned by Twitter. But she’s always struggled with the truth.

The author’s latest book “Outrages” has been postponed. But she was once essential reading.

Expertise matters. But lane-policing is counterproductive.