(Most) humans posses a certain level of general intelligence. Human groups, augmented by automation tools, and given enough time, possess a much more advanced general intelligence. The "no free lunch theorems" imply that it's impossible to get a fully general intelligence in every environment, but we come pretty close.

I've somewhat refined my views of what would count as general intelligence in a machine; now I require mainly that it not be extremely stupid in any area that humans possess minimal competence at. Out-of-domain tests are implicit ways of testing for this, without doing the impossible task of testing the computer in every environment.