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High Quality Content by WIKIPEDIA articles! The Tipping Point: How Little Things Can Make a Big Difference is a book by Malcolm Gladwell, first published by Little Brown in 2000. Tipping points are "the levels at which the momentum for change becomes unstoppable." Gladwell defines a tipping point as a sociological term: "the moment of critical mass, the threshold, the boiling point." The book seeks to explain and describe the "mysterious" sociological changes that mark everyday life. As Gladwell states, "Ideas and products and messages and behaviors spread like viruses do." The examples of such changes in his book include the rise in popularity and sales of Hush Puppies shoes in the mid-1990s and the precipitous drop in the New York City crime rate after 1990. Gladwell describes the "three rules of epidemics" (or the three "agents of change") in the tipping points of epidemics.