You could settle for a genetics explanation, but why would you? Other hypotheses are much more easily testable, and certainly more inspiring to the newcomer, a

You could settle for a genetics explanation, but why would you? Other hypotheses are much more easily testable, and certainly more inspiring to the newcomer, and haven't been scientifically exhausted yet. If everyone just said "it's probably not in my genes" they wouldn't even try, disregarding tons of historical factors that may have stopped their ancestors from creating a record.