After centuries of speculation, biologists have documented one way a strange group of octopuslike creatures use their seashell-shaped cases. Female argonauts, a group of four species that are close ...

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Four teams are diving to the deepest part of the ocean, the Mariana Trench, which lies 11km (7 miles) down in the western Pacific. One of them is DOER Marine, a marine technology company based in San ...