we all take risks every day. For example, we take risks when we cross the street, ask someone for a date,or ask the teacher a question that we think is "stupid" These are everyday risk-actions that have uncertain results. However,some risks are extreme.For example,participating in dangerous sports such as mountain climbing and skydiving can be extremely risky. Why do some people like extreme or dangerous sports?Do they want to hurt themselves? Or is there some other reason? Psychologists are people who study human behavior,and some psychologists study risk behavior. These experts might have some of the answers.