Also known as https://en.wikipedia.org/wiki/Ship_of_Theseus

> This bias is pretty interesting since by that definition we all die multiple times, as the particles that constitute our body are literally interchanging with the environment over time. But we don't feel uncomfortable about that fact.

I've wondered about that, is it strictly true? Aren't there heavy metals and other elements that are accumulated in the body over time? Or at least, they are eliminated so slowly that you'd never rid yourself of them completely before dying. I guess bones replace themselves every 10 years so any incorporated metals would have a chance to be eliminated on that timescale. But what's to stop a few of those elements making their way back into another structure after being ejected into the blood stream? Maybe we've all got a few persistent cadmium or lead atoms hanging out in our bodies from birth to death. Ship of Theseus crisis averted!