"It's one of the things that makes it enjoyable to keep playing; you have to approach each set differently and make some balance between what you want to do and what seems right."

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It's clear that North took some original steps in that direction, but Hall probably had the most complete approach and should get the most credit. But for Hall, unfortunately, the data are all impressionistic - what people said. None of his machinery survived. His patents were all lost in the Patent Office fire.

— Charles R. Morris