One species of single-celled phytoplankton has a secret weapon for an awfully difficult task: getting from the darkest depths of the ocean to the surface despite having no appendages. It puffs up to six times its normal size. This inflation takes Pyrocystis noctiluca, which is normally just a few hundred micron wide, toward the surface so it can capture sunlight to make food. "(These) cells are like little submarines," said one researcher who discovered the phenomenon. Read more about how scient

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