In this story by Harry Harrison, an Air Force scientist buys a trick rocket from a toy fair. A thin piece of string makes the rocket rise and fall, and he plans to entertain some other scientists with it at a poker party. At the party, the scientists discover that the trick only works in certain conditions. They are curious as to why, because it seems that the toy may break a basic law of physics. What they don’t know is that this is all part of a plan for them to help make someone else very rich.
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