I once spend a ( drunken ) evening discussing with a neurosurgeon about the possibility to add a prosthetic tail to the human body. The base structures to cont

I once spend a ( drunken ) evening discussing with a neurosurgeon about the possibility to add a prosthetic tail to the human body. The base structures to control a tail are present in our brain, sure we lost it a few million years ago but still a tail is much more realistic than e.g a second pair of arms.