One hundred years ago, Sam Loyd invented the "14-15 puzzle". The goal was to order the numbers moving the pieces. The thing was that if you were able to find out the solution you would win 1.000 dolars.
It was a real feber around USA.... 1.000 dolars was a big amount of money. But noboy asks for the price. You know why?
Because there is no solution. From a math point of view it is imposible to order the numbers. What a joke!!!