Here's a salient excerpt:
Now, Kurzweil is predicting the arrival of something called the Singularity, which he defines in his book on the subject as "the culmination of the merger of our biological thinking and existence with our technology, resulting in a world that is still human but that transcends our biological roots."
"There will be no distinction, post-Singularity, between human and machine or between physical and virtual reality," he writes. Singularity will approach at an accelerating rate as human-created technologies become exponentially smaller and increasingly powerful and as fields such as biology and medicine are understood more and more in terms of information processes that can be simulated with computers."
By the 2030s, Kurzweil said, humans will become more non-biological than biological, capable of uploading our minds onto the Internet, living in various virtual worlds and even avoiding aging and evading death.
In the 2040s, Kurzweil predicts that non-biological intelligence will be billions of times better than the biological intelligence humans have today, possibly rendering our present brains obsolete.
"Our brains are a million times slower than electronics," Kurzweil said. "We will increasingly become software entities if you go out enough decades."