Australia plans world's largest marine reserve

The Australian government has said it plans to establish the world's biggest marine protection zone to safeguard a huge swathe of the Coral Sea, a biodiversity hotspot brimming with life.

Mystery solved: Scientists ID Caribbean sea urchin killer

Last year, sea urchins in the Caribbean started getting sick—shedding their spines, dying off and throwing reef ecosystems into chaos. Now, scientists think they've caught the killer in this marine murder mystery.

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