Have all of us been here since the dawn of time as little Atoms?

Question

Have all of us been here since the dawn of time as little Atoms?

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Answer 1

Dr Lawrence Krauss talks about how we [are all stardust](https://www.youtube.com/watch?v=s0L8qP3qCq4).

I tried finding a link to an article about a scientist or student that proved that every time we breathed (or possibly drank water – I forget) we were breathing or drinking some of the same atoms or molecules that Shakespeare / Caesar / Hitler all did too. He took a thought experiment and did the math.