[chernov]

One may argue you are a different person even once some of your cells are replaced.

I imagine your next question might be whether you owe something to now-me if you were to take a loan from a previous-me.

This looks like a pair of mirror bugs. Yeah, the person is already a new one, but if we'd really treat them that way, we'd have to make our laws and morals even more complex. Instead, we just pretend that's the same person.

[shoes_for_thee]

These are excellent, very much open questions.

I mostly wanted to point to the parent comment and say, "Things are not quite so pat." I should have explicitly said so.

Sometimes I think paradoxes exist to teach us that many things are not precisely true or false.

[ZoomZoomZoom]

So, one grain of sand is a heap?

If one cell is enough, than one atom is enough and so on. Then, nothing's really the same. But we use this notion because it's convenient, so we're back at the beginning.

[chernov]

>So, one grain of sand is a heap?

"Is a single grain a heap" doesn't look like a paradox to me. A "heap" is just a word with an ambiguous definition. Once you define it, you'll have your answer :)

>Then, nothing's really the same

If that was the case, intelligence would've been impossible. We need similarities as well as the differences to be able to compare things (including abstract concepts)