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 presen

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