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A comment on Almost 25% of world’s seafloor now mapped. Parent comment
The safest class of substances I can think of are unusual isotopes.
They're chemically identical to the regular elements, which is what matters for life forms, but can be detected by scientific instruments.
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The safest class of substances I can think of are unusual isotopes.
They're chemically identical to the regular elements, which is what matters for life forms, but can be detected by scientific instruments.