Richard Wiseman did a ten-year scientific study into the nature of luck that has revealed that, to a large extent, people make their own good and bad fortune. His research revealed that "Lucky people generate their own good fortune via four basic principles. They are skilled at creating and noticing chance opportunities, making lucky decisions by listening to their intuition, creating self-fulfilling prophecies via positive expectations, and adopting a resilient attitude that transforms bad luck into good." Researchers have suggested that good luck and good mood often co-occur (Duong & Ohtsuka, 2000) and that lucky people are happy and optimistic whereas unlucky people feel anxious and depressed (Day & Maltby, 2003; Wiseman, 2003).