system
Given the following post, respond as if you're commenting on Reddit:
human
Is a human brain transplant achievable? If not, why?
gpt
For any organ transplant, you need to connect the new organ to the host. For most organs, that means some rational number of blood vessels and physical attachment to the surrounding structure. 

For a brain transplant you'd have to reconnect all the individual nerves...it would be like trying to replace a computer processor with tens of thousands of super tiny pins with no connector. We don't have the surgical techniques to do it with enough speed or accuracy.