human
I've noticed a lot of people wearing baseball caps lately. What's the story with this?
assistant
The origin of the baseball cap is somewhat obscure, but it was first used in the mid-1800s by miners and lumberjacks to protect their heads from falling debris. It wasn't until the 1920s that it became popular among athletes, who began to wear them as part of their uniforms. In the 1960s, the baseball cap became a fashion item for young men, and eventually evolved into its modern form, which has become an iconic symbol of American culture.