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A group of researchers published preliminary results from what will be the most comprehensive review of jellyfish population data. They say there is not yet enough evidence to support any conclusions about a global upswing in jellyfish populations. The main problem, say the scientists, is that jellyfish are notoriously difficult to study. But the creatures could serve as key indicators for the health of the oceans, so scientists are now building a database of jellyfish research and exploring new ways to keep track of them. [Source: Nature News]
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