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Experts alarmed as harmful creatures spread in US waterways: 'The worst … that we've seen'

Researchers from Florida International University have discovered Asian swamp eels in the Florida Everglades. The 3-foot eel, ...

Wildfires ripping across Australia, Argentina and South Africa

Firefighters are battling several wildfires ripping across Australia, Argentina and South Africa. NBC News' Raf Sanchez has ...