At one time it was possible for one man to know everything known to his culture (anything more is unreasonable to ask). The Greek philosophers, Archimedes, Galileo, Leonardo might have been such people.
But the amount of knowlege out there has expanded leaps and bounds, and now it is no longer possible for one man to know much outside his own specialty and maybe a couple more.
But the amount of knowlege out there has expanded leaps and bounds, and now it is no longer possible for one man to know much outside his own specialty and maybe a couple more.