The term “tipping point” comes from the medical field of epidemiology: the study of the causes and transmission of diseases. It refers to the moment in time when an infectious disease reaches a point beyond any local ability to control it from spreading more widely. The tipping point is a turning point—the critical time in an evolving situation that leads to a new and often irreversible development. A tipping point can tilt in either a good or bad direction. ...

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