Optimists once believed that universal literacy was inevitable. Now it seems that the age of reading might be a short anomaly in human history.

In 2024, in a national test, just 35 percent of high-school seniors were “proficient” at skills such as analyzing complex fictional themes and evaluating the effectiveness of an author’s argument. About the same number scored below “basic,” meaning that they may struggle to draw conclusions from concepts explicitly included in a text, or to use context clues to determine the meaning of an unknown word. Adult-literacy scores have also dropped: Nearly 30 percent of American adults cannot paraphrase or make inferences from a multipage text. In 2017, that number was less than 20 percent.