The skeletons of brittlestars, which are sea creatures related to starfish and sea urchins, contain thousands of tiny lenses that collectively form a single, distributed eye.

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Tonight, a sea of black-haired 20- and 30-somethings form a line around the block.

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Either way, the CO2 must be put somewhere, for which strategies include pumping it into rocky formations (such as depleted oil and gas wells) at a pressure of 100 atmospheres, or even piping it in liquid form under pressure onto the sea-floor where it is cold enough and the pressure high enough that it is hoped the material will stay there, assisted by the formation of CO2-hydrate.

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Then they dissolve into nothing, only to form as if by stealth on a different horizon, dancing across the sky in the shape of a sea horse or crescent moon.

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