Perceptual biases are everywhere, and you can find them if you know where to look. I went for a walk on a trail this morning and saw more bikers than joggers and more joggers than walkers. Does this mean there were more bikers than joggers and more joggers than walkers? No. Even if there were the same number of each, I'd see mostly bikers, because they're covering more ground in a given amount of time and therefore are more likely to pass me than walkers, who are moving at about the same speed as me. (This is especially true for people moving in the same direction as me.) Admittedly, this specific perceptual bias probably isn't harmful, but many others are, such as stereotypes perpetuated by mainstream media that create a distorted view of reality. More about those in future posts. Until then, pay attention! As Yogi Berra said, you can observe a lot just by watching.