Liz Bonnin launches a large experiment to learn about the nation's sense of smell, and Dallas Campbell investigates new evidence that life on Earth might have originated in space. Dr Yan Wong hands out free wine to shoppers in Rugby, and on the 25th anniversary of Back to the Future, Jem Stansfield tries to build a car fuelled by junk. Last in the series
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Ready to Watch Bang Goes The Theory, Season 2, Episode 8?