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Andy Weir author of the book 'The Martian', made into the new sci-fi movie of the same name, tells Jack Stewart what his character – the stranded astronaut Mark Watney might have made of the briny water flows just found on Mars. (Photo caption: Matt Damon in a scene from the film, 'The Martian' – credit Aidan Monaghan/20th Century Fox via AP)
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