We saw similar technology in action earlier this year, when the world's first

Bones

For the most part, bones are pretty easy. Just about anything from a tibia to a

You don't have to replace the bone entirely to enter the cyborg arena.

Organs

The plight of the cyborg gets a little more complicated once we move to things like internal organs, which have proved more difficult to replicate. Artificial hearts exist but are used more as stop gaps to help patients survive long enough for a transplant, although the technology

Things get even more complicatedbut promisingfrom there. Doctors have successfully built an artificial stomach, but

Brains

This is a tough one. The (very long) quest to build an artificial brain can be divided up into two parts: recreating the brain's architecture and perfecting artificial intelligence. Engineers are constantly coming up with new supercomputers that mimic the brain's neural network. Some

Building a neuron network isn't the same as building a brain, though. You have to make the thing think. The challenge of making a cognizant machine has proved to be incredibly difficult, and even though we're seeing artificial intelligence in more and more everyday applications (think: Siri) we don't yet have a way to make machines completely think for themselves. We do have artificial brains that

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How Close Are We to Building a Full-Fledged Cyborg?