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The stone-eaters that threaten Iran's ancient Persepolis
Conservationists at Persepolis, Iran's most iconic ancient site, are waging a delicate battle against an unlikely adversary: ...
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Persepolis battles persistent lichens to preserve ancient Persian heritage
Conservationists at Persepolis, Iran’s most iconic ancient site, are waging a battle against an unlikely enemy. They are fighting lichens, organisms that grow on surfaces like stone and can ...