The assignment: think of something to change the world and put it into action. Trevor conjures the notion of paying a favor not back, but forward$--$repaying good deeds not with payback, but with new good deeds done to three new people. Trevor's efforts to make good on his idea bring a revolution not only in the lives of himself, his mother and his teacher, but in those of an ever$-$widening circle of people completely unknown to him. $2.$ There are about $4\mathrm{.}7$ million people in the Metro Phoenix area, how long would it take for everyone in the Phoenix Metropolitan area to receive a good deed? $($Census Bureau $2017)$