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A new climate experiment will test an unusual mineral on coastlines to help remove excess carbon dioxide from the atmosphere. Scientists and climate experts are testing crushed olivine, a naturally occurring mineral that can help remove carbon dioxide under the right conditions.

Imagine you're playing "20 Questions" and you start with the classic opener: "Animal, vegetable, or mineral?" Most of the time, a sea worm would be an easy answer: animal. But one particular marine species, the ancient and still-living bristle worm Perinereis cultrifera, complicates that simple choice.