child prodigies can focus their attention for long periods of time, concentrating on tasks that would bore other children of the same age. Abigail Sin practiced piano at least 25 hours a week. Similarly, two-year-old Ngu had the concentration to play chess for hours at a time. The distinction of "prodigy" thus goes beyond mere intelligence. For explanations, experts look in two direction: nature, the child's unique biology, and nurture, the child's environment.