Question
The formula you're referring to is likely the Copernican Principle developed by Astrophysicist J. Richard Gott III. This principle is a method to predict how long something will last. The basic idea is that, in the absence of other information, we can assume that we are observing a situation at an average or typical point in its duration. Therefore, if you know how long something has been going on, you can predict that it will continue for about the same amount of time.
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Astrophysicist J. Richard Gott III developed the Copernican Principle in 1969 – a method to predict how long something will last. When he visited the Berlin Wall, he wondered how long the wall would last. Since he didn't know how long the wall's life span would be, Gott could assume that, on average, his arrival would be around halfway through. Therefore, he guessed that the wall would stand for another eight years. In this case, the Berlin Wall stood for 20 years, not eight.
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