From Wikipedia's page for the author: http://en. wikipedia. org/wiki/William_P%C3%A8ne_du_Bois Peter Graves (1950): A well-meaning but mischievous boy who encounters a gentlemanly and not-very-mad scientist named Houghton Furlong. Furlong is the inventor of an antigravity material named Furloy, and a Furloy-based invention called "the ball that bounces higher than the height from which you drop it. " In an unfortunate accident with the latter invention, Peter destroys Houghton's house. Little of value is left in the wreckage except six balls of Furloy, each about the size of a tennis ball, with an antigravity pull of 25 pounds-force (110 newtons) each. Peter commits himself to spending the summer with Houghton in an attempt to earn the $45,000 necessary to rebuild his house. The implied puzzle is: how can Peter and Houghton make use of the six Furloy balls to earn $45,000?
