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Brittany Kaiser was one of the whistleblowers who brought down her former employer, Cambridge Analytica. She helped to expose how the data analysis firm had collaborated with Facebook to profile millions of voters around the world, in order to target them with tailor-made propaganda.In an extended interview, she tells the BBC's Jane Wakefield how our data is still open to abuse by those seeking to undermine democracy by manipulating the way we vote.(Picture: Brittany Kaiser in Washington, DC; Credit: Bill O'Leary/The Washington Post via Getty Images)

Esther Duflo discusses her work on the economics of poverty, for which she won this year's Nobel prize, along with her husband Abhijit Banerjee and co-author Michael Kremer.The 46-year old French-American MIT economist is the youngest person ever to be awarded the prize, and only the second woman. Ed Butler asks her how she and her collaborators examined how people in poverty respond differently to economic incentives, and her views on how her profession could benefit from being less male-dominated.(Picture: Esther Duflo; Credit: Patrick Kovarik/AFP via Getty Images)

How hydroelectric dams are powering cryptocurrency mining on the eastern edge of Europe. Ed Butler travels to Georgia to visit the Bitcoin mines benefiting from cheap electricity and tax benefits.(Photo: A hydroelectric dam on the Inguri River in Georgia, Credit: Getty Images)