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320 pages, ebook
First published September 2, 1990


John called it the For-want-of-a-nail syndrome. For want of a nail the battle was lost. Something small suddenly becomes hugely enlarged. Something calm suddenly becomes enraged. Something flowing smoothly in one instant becomes turbulent. How or why does this happen? What if, John said, there are small perturbations that we miss or ignore; tiny irritations that we regard as fundamentally inconsequential. These small perturbations may have large consequences. In science, so in life.