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Mystery orcas in WA Puget Sound: Where did they come from?

Marine life researchers are tracking a mysterious pod of orcas recently spotted moving through the Salish Sea.

Icebergs, penguins and 23ft waves: Our science editor reviews a 'once in a lifetime' trip to Antarctica that involved crossing the world's most terrifying stretch of ocean

If you can explain Antarctica, you've never been there.' That was the quote from our captain, Jorn Bowitz, as we set off on our voyage to the White Continent.