Ask Ira: Coral Spawn by Moonlight

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One night in November each year, hundreds of species of coral spawn. Scientists have puzzled over how coral living over a thousand miles apart on the Great Barrier Reef know when to do the deed. A new study published in the journal Science may explain why. Photos courtesy of Jez Roff, Ove Hoegh-Guldberg, University of Queensland. Thanks to Lior Appelbaum. Produced by Flora Lichtman. Viewed 1343 times.

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