Biology would actually back up that claim - humans are similar to one another in several ways, such as general anatomical structure, survival instincts, social habits, and psychology, but each person's DNA is different, as well as the ways we choose to achieve our ends, our limits and our strengths, our preferences, and how we process information. As a species, we are different enough from each other that we can work as a group more productively but similar enough that we are capable of relating to one another, and that fascinates me.