I think one should keep in mind Arthur Clarke's quote: “When a distinguished but elderly scientist states that something is possible, he is almost certainly ri

I think one should keep in mind Arthur Clarke's quote: “When a distinguished but elderly scientist states that something is possible, he is almost certainly right. When he states that something is impossible, he is very probably wrong.” — Arthur C. Clarke A declaration that some broad systemic thing is impossible suggests some hubris in the certainty that all possible options have been analyzed. The declaration that something is possible on there other hand, then there is some reasonable chance that the suggested path has been well analyzed.