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VIDEO: Scientists solve the mystery of starfish wasting disease

New evidence suggests that the wasting disease that has killed off millions of starfish from California to Alaska has been caused by a virus found in sea stars since the 1940s. It's unclear if the illness is part of a natural cycle or if other causes are to blame, but the disease is still spreading.

Read more: Amid symptoms of starfish die-off, researchers look for a cause

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