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We're all familiar with the highway driving experience of being behind a person who is continually braking for no apparent reason. This is especially problematic if you're in the left-hand lane. You're zipping along at the posted speed limit and suddenly the brake lights of the car in front go on. You

In the language of statistics, health is a continuous variable. A person's health can be expressed as an infinity of values ranging from abundant well-being to terminal states approaching death. If health were a discrete quantity you could assign a number to it. You could say that someone had 95% health