Were you someone else before you were you?

[VooMan]

I find it interesting that in one year, every single cell in your body has changed. Every single cell... not one bit of you is the same as it was a year ago... But yet we keep our memories, personalities, even the scars from old wounds.

Atoms that are billiions of years old make up our new cells... And at the same time, we get older and are not quite what we used to be...