From the time we’re babies, our brains constantly sort and label the world around us — a skill that’s crucial for our survival. But, as adolescents are all too aware, there’s a tremendous downside: when we do this to groups of people it can cause great harm. Here’s a comprehensive introduction to the science behind stereotypes that will help young people make sense of why we classify people, and how we can change our thinking. It covers the history of identifying stereotypes, secret biases in our brains, and how stereotypes affect our sense of self. Most importantly, it covers current research into how science can help us overcome our biases, offering hope for a future where stereotypes are less prevalent and the world is more fair for everyone.