Oceans warmer last month than any May on record

Global oceans were warmer last month than any other May in records stretching back to the 19th century, the European Union's climate monitoring unit reported Wednesday.

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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