Behavioral modernity is a term used to describe how people today live differently than people did in the past. It's all about the way we think and act - so it looks at how we communicate, how we use tools and technology, how we solve problems, and how we understand the world. We've developed a lot of new skills since prehistoric times, which makes us different from the people who lived a long time ago. For example, today we use smartphones to stay connected, computers to do research, and airplanes to travel around the world. These are all things that people didn't have in the past.