It all started with the social studies teacher s extra-credit assignment: come up with a plan to change the world for the better， and do it. Twelve-year-old Trevor McKinney began by doing something good for three people. But instead of paying him back， he asked them to "pay it forward" by doing a favor for three more people， who in turn would help three others， and so on， each act a link in a chain of human kindness. And no one -- not his teacher， his mom， or anyone in his small California town -- could ever have dreamed of how far Trevor s plan would go.
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