Corals Engineer Their Own Currents

There are few more monastic lives in the animal kingdom than a coral’s. In adulthood it gives up swimming to settle on the ocean floor, surround its spineless body with clones, and become a rock. Mouth facing the ocean, it waits passively for whatever drifts by—or maybe not so passively. Taking a closer look at these creatures, scientists have discovered that corals use their tiny bodies to create swirling currents that are relatively enormous. By forcing the ocean water to move molecules cl

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