All of the atoms in your body are constantly being renewed and the ones you were born with are no longer a part of you. Your atoms are probably spread all around the planet right now, especially the ones you have breathed in or out.
You have most likely breathed an oxygen atom that Einstein (or any other person really) breathed while writing his famous equation. Of course those atoms would have to still be on Earth for that, so if they all got struck by cosmic rays and were blasted off into space, then you are out of luck. But hey if that is the case, then you are breathing a proton sent from across the galaxy!
Though in a way, all of the atoms here were sent from across the universe, considering every element outside of Hydrogen was birthed in the core of a star at some point. Then those stars had to explode to spread their atoms elsewhere, which eventually came together in a momentary flow to create you.