So what does it take to be a genius then? If Einstein had been born in the middle ages would he still be remembered as a genius?

> So what does it take to be a genius then?

A genius is a person who is capable of incredible leaps of understanding and originality. That's difficult to measure so we recognise geniuses through the work they achieved...the theory of evolution marks Darwin as a genius, and relativity does the same for Einstein. Jobs may well have been a genius, but his achievements aren't at the level most people think of as genius.

In other words: "I don't know but I'll tell you when I see one."

That's the problem with these sorts of definitions. It's nearly impossible for anyone to agree on the edge cases.