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Darwin's theory of evolution is among the greatest in history, but his own cousin Francis Galton's twisted it to pioneer the idea of Eugenics. Whose ideas were the more powerful?

It's the most celebrated period of British ingenuity, but are our Victorian forebears due a rethink? Sci-curious sisters Kat and Helen Arney are on hand with some revisionist revelations that could turn what we think we know completely upside down.

Charles Darwin's discoveries have done more than anything before or since to radically change the way we think about natural history and where we came from. It's one of the most robust and powerful scientific concepts of all time and Darwin applied it across the animal kingdom - but he was always reluctant to be drawn on the role of natural selection in human development. However, his cousin Francis Galton had no such qualms, and used Darwin's ideas to develop a theory of Eugenics.

Between the good of Darwin and the bad of Galton, whose ideas were the more powerful?

Helen Arney is a presenter and comedian, and Dr Kat Arney is a writer and broadcaster who has published a book on genetics.

A Hat Trick production for BBC Radio 4.

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15 minutes