"I think I repeated the Heisenberg Uncertainty Principle in my head at least one thousand times: the mathematical product of the combined uncertainties of concurrent measurements of position and momentum in a specified direction could never be less than Planck's constant, h, divided by 4p. This meant, rather encouragingly, that my uncertain position and zero momentum and the Beast Responsible for the Sound's uncertain position and uncertain momentum had to sort of null each other out, leaving me with what is commonly known in the scientific world as "wide-ranging perplexity."