Storytelling is a universal human trait. It emerges spontaneously in childhood, and exists in all cultures thus far studied. It’s also ancient: Some specific stories have roots that stretch back for around 6,000 years. As I’ve written before, these tales aren’t quite as old as time, but perhaps as old as wheels and writing. Because of its antiquity and ubiquity, some scholars have portrayed storytelling as an important human adaptation—and that’s certainly how Migliano sees it. Among the Agta, her team found evidence that stories—and the very act of storytelling—arose partly as a way of cementing social bonds, and instilling an ethic of cooperation.