Nanotech Could Make Humans Immortal by 2040, Futurist Says

"The definition of human is that we are the species that goes beyond our limitations and changes who we are," he said. "If that wasn't the case, you and I wouldn't be around because at one point life expectancy was 23. We've extended ourselves in many ways. This is an extension of who we are. Ever since we picked up a stick to reach a higher branch, we've extended who we are through tools. It's the nature of human beings to change who we are."

But that doesn't mean there aren't parts of this future that don't worry him. With nanotechnology so advanced that it can travel through our bodies and affect great change on them, come dangers as well as benefits.

The nanobots, he explained, will be self-replicating and engineers will have to harness and contain that replication.

"You could have some self-replicating nanobot that could create copies of itself... and ultimately, within 90 replications, it could devour the body it's in or all humans if it becomes a non-biological plague," said Kurzweil. "Technology is not a utopia. It's a double-edged sword and always has been since we first had fire."

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