How Zeynep Tufekci Keeps Getting the Big Things Right

When the Centers for Disease Control and Prevention told Americans in January that they didn’t need to wear masks, Dr. S. Vincent Rajkumar, a professor at the Mayo Clinic and the editor of the Blood Cancer Journal, couldn’t believe his ears.

But he kept silent until Zeynep Tufekci (pronounced ZAY-nep too-FEK-chee), a sociologist he had met on Twitter, wrote that the C.D.C. had blundered by saying protective face coverings should be worn by health workers but not ordinary people.