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.

Radiation risk at historic WA nuclear test site 70 years on

More than half a century since Britain conducted the first nuclear tests in Australia, at the Montebello Islands in WA's north, marine scientists have discovered there remains a radiation risk to marine life and tourists.

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