> Holding a donors brain in one's hand (it's smaller than one would expect). In the words of a lab partner, "I can't believe we are holding everything that made this person a person, all their personality, everything."

Thought provoking. I'll keep this in mind while holding a hundred billion apples during lunch. ;)

From another angle, I would argue that the eyes and face are part of what makes a human, as are the hands. And there's also something in the brain that has been lost, something beyond mere physical matter. An easy example of this is a puzzle, if you're putting a puzzle together, and I come in and mix it up, I've taken something from you, and yet I took no material object away. There's probably some organization that's part of our brain and "humanity" that is lost at death. I'm not talking about religious "spirit" here - back to the puzzle, it has no spirit, but an assembled puzzle is more than the physical material it is made of.

I don't mean to be super critical of your lab partner, just sharing some additional philosophical views.