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That's probably part of it, but the point remains that in predicting the future, you can't discount the possibility that pigs may in fact fly.
In fact, with our ability to manage genetics, one could almost be certain at this point that pigs WILL fly. Think about that for a moment... the very metaphor for the impossible could almost certainly be achieved within our lifetimes, if we wanted it. Talk about raising the bar. We should do a flying pig instead of a Mars mission.
Point is, innovations happen, we get more productive, we advance and this all has a bearing on the future, which is why it's impossible to predict.
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