Humans and machines would eventually merge, by means of devices embedded in
people's bodies to keep them healthy and improve their intelligence, predicted
Mr Kurzweil.
"We'll have intelligent nanobots go into our brains through the capillaries
and interact directly with our biological neurons," he told BBC News.
The nanobots, he said, would "make us smarter, remember things better and automatically go into full emergent virtual reality environments through the nervous system".