Hmm... Oh! Ok. I think I get it! Kind of like... how you can pluck leaves off a plant, but as long as the plant is still alive, it can always grow new leaves? Or like my hair! [he plucks one of the fluffy hairs on his neck] As long as my skin is still healthy, these individual hairs can be "killed". Ah.... but that new leaf or hair might not remember what the old one knew.