Every Atom in Your Body Is Replaced every 5 Years

[Pardel-Lux]

Here it is:

Water Molecules and Christopher Columbus

I remember something from my childhood that I am trying to confirm. I was told that if Christopher Columbus had dumped a cup of water in the ocean, any cup of water taken from any ocean today would have at least 250 molecules from the original cup of water Columbus dumped. Can this be true?!

But there was another one later, that was even better. Can’t find it. My discourse-fu fails.
That is the one I meant:

What is the possibility: You’ve peed a molecule of Titanic’s iceberg i

Assuming you live in eastern N America or western Europe and are over 30 years old?