What would ‘The Martian’ do with water on Mars?

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)