It's a great essay but this passage highlights to me the sillyness of philosophy:

> I learned that I don't exist. I am (and you are) a collection of cells that lurches around driven by various forces, and calls itself I. But there's no central, indivisible thing that your identity goes with. You could conceivably lose half your brain and live. Which means your brain could conceivably be split into two halves and each transplanted into different bodies. Imagine waking up after such an operation. You have to imagine being two people.

Take a living person and excise part of their brain, and they will continue to live. There have been accidents, injuries, and surgeries that have proven that. I don't know about fully half, but I would not be surprised if it worked.

BUT - take half a brain and transplant it into a different body? There is zero evidence today that that is even possible.

One might say that such technology just hasn't been invented yet. True. But maybe it will never be invented; and thus it's really science fiction disguised as philosophy. I think quite a lot of philosophy ends up being disguised fiction--science or otherwise.