This is part two* of a great long-form essay on the topic of a technological singularity, and its impact on humanity. Even if the majority of HN users are familiar with the concepts, the prose of this essay is very readable, and it's a great piece with which to introduce non-technical people to the topic.
[*] Part one is here: http://waitbutwhy.com/2015/01/artificial-intelligence-revolu...