Maybe it's just because I have a deep-seated terror of brain surgery, but this all sounded absolutely terrifying to me.

I also hate, hate, HATE that Musk said that the monkeys were all ill. Not only is this 100% bullshit -- this would completely invalidate the data -- but it also indicates that like most things, he has a 13 year old's understanding of life. He thinks that something that is sick has no right to safety, because, like, they're already on borrowed time or something, right? I'm certain that to him, the stakes of these tests are lower because it's not like, healthy full people like him who will eventually use these to get cybernetic super powers. These are humans with disabilities. They're expendable test subjects. They're lucky to get even a chance at improvement. Plus, serving as guinea pigs gives them a chance to be useful to the great Elon Musk's ambitious. Absent that they're just a waste of food to him.