When will the first healthy, functioning human body part be voluntarily replaced by a prosthetic?

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§ Judgement rule

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This question will be settled by the point in time when the first prosthetic will replace a healthy, fully functioning body part of a human. The person will have to volunteer to remove the healthy limb or organ in order to be fitted with an artificially created replacement.
Reference date: Dec. 31, 2028, 24:00 UTC

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A matter of time?

We still need a few breakthroughs for prostheses to reach a level that they can compete with the original body part. For artificial limbs brain-machine interfaces are needed for better control, as well as advances in engineering for better mobility. Artificial organs can be grown from the patients own cells and attached to a designed graft, opening the possibility of enhancing the functionality.

In some fields prostheses can already outclass the original part, as demonstrated by the double amputee Hugh Herr, who actually improved his climbing capabilities by modifying his prosthetic legs.

When will a person voluntarily replaces a fully functioning body part with a prosthetic one, or will people decide not to? 

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Top 5 participants (Ranking) Credits
1. R. Bitrary 3,091.76
2. Pezi B. 1,962.96
3. Carl Utt 543.04
4. Onn Wei 73.42
5. Matt Redfern 68.94
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R. Bitrary
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Countdown to final result Dec. 31, 2028, 19:00:00 2028/12/31 24:00 UTC