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Major events means a really important event that happened or is going to happen
If the probability of an event is zero then that event cannot happen
It is on a scale of 1 to 0 of a probability that an event will happen or it will not happen
Tunguska event happened in 1908.
Probability is measured on a scale of 1 to 0 and at 1 an event will happen but at 0 an event will not happen.