Probabilities are measured on a scale of 0 to 1.

Even a "zero" probability is not an indication that an event will never
happen.

A zero probability states that an even "almost never" happens. A
probability of one states that an event "almost always" happens.

Therefore, probability theory would state that, while the probability
of rolling a 7 is zero, there is still a chance (however small) of it
occuring.

Let me put this another way. Prior to 9/11/2001, most Americans would
have said that the probability of two airliners striking both towers of
the World Trade Center within minutes of each other and destroying
both, was zero.

Yet, it DID happen.

LRod actually did make a cogent point in one post that he was willing
to settle for a "reasonable estimate". That is actually a good way of
explaining the situation.

The lesson to be learned here is to refrain from making absolute
statements like "zero chance".

Gus