Cheltenham Science Festival 2017

Ellen Stofan, former chief scientist at NASA, talks about whether opinion has overtaken established scientific facts. Plus, Jeni Tennison from the Open Data Institute and Hetan Shah from the Royal Statistical Society discuss whether algorithms know best. And signal processing expert Mark Plumbley and cyber-security specialist Jason Nurse assess to what extent our mobile devices are listening in on us, and whether we should worry about it. Presented by Rory Cellan-Jones.

(Image: Maker tent at the Cheltenham Science Festival 2017, Credit: BBC/ Jat Gill).