Despite living in waters that are more acidic than average seawater, the corals living in the bays around Palau’s Rock Islands are unexpectedly diverse and healthy. (Photo courtesy of Palau International Coral Reef Center)

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Despite living in waters that are more acidic than average seawater, the corals living in the bays around Palau’s Rock Islands are unexpectedly diverse and healthy. (Photo courtesy of Palau International Coral Reef Center)