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Re:Half of American kids have lead in their blood, doctors say by Jabbles on Tuesday September 28, 2021 @11:15AM (#28683793)
The number of possible chemicals is vast, due to the exponentially large number of ways you can combine the elements. So although every stable element is present in the average human, every possible chemical (or compound) is not.

Recent discussion: https://news.ycombinator.com/item?id=27634549

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