We have a world in hand. We're not trying to build a world simulation, we're trying to build intelligences. By the time we get this far, the infant will probably be embodied, and we can use real "mothers". Some speculate that a non-embodied being can never become intelligent.
Bear in mind we are talking about at least 20 years hence, in my mind.
Bear in mind we are talking about at least 20 years hence, in my mind.