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X-ray machines don't look at chemical composition, they care about density. Paper is quite dense, and a thick enough pile of it will show up as a solid block o
by djrogers 10y ago
X-ray machines don't look at chemical composition, they care about density. Paper is quite dense, and a thick enough pile of it will show up as a solid block of 'something'.
- marcosdumay 10y agoThey differ elements by row of the periodic table, and modern ones have special filters for separating a single interesting element from the rest of its row.