Cientistas buscavam navio naufragado e encontram mais de mil estruturas misteriosas sob gelo da Antártida
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This article says researchers searching for a shipwreck instead found more than a thousand mysterious structures beneath Antarctic ice, but later determined the shapes were nesting sites for the Antarctic fish Lindbergichthys nudifrons. It is a good example of a discovery that initially looked anomalous before being explained by biology.
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