"So tap water almost always comes from surface water, which was seawater before that. A year before it comes out the tap, in most parts of the world, my guess is that most of that water was part of an ocean. Which means: a couple years before they are born, most of the molecules that make up a person are part of an ocean β€” as are most the molecules which will compose people born a year or two from now."

https://finmoorhouse.com/writing/future-people

Where do people come from?

Falling down a rabbit hole