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Hr1: News Roundup, Dinos and Dark Matter.

Subscribe: http://www.sciencefriday.com/audio/#page/full-width-list/1 A look at this week in science, physicist Lisa Randall explores the theory that a disc of dark matter could have been responsible for the demise of the dinosaurs, and visual effects art director John Bell talks about how he imagined the then-distant world of 2015 for Back to the Future II.

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