Eugenics is an ideology which many had hoped is now something spoken of in hushed tones, a sinister intellectual dead-end that was forever abandoned with the fall of Nazism. But, as fascism merely evolved into new forms, so, too, did eugenics. The Olympics have provided a backdrop for a resurgence of ideas of racial essentialism, with a Channel 4 documentary promising to shed light on the controversial truth. When talking about eugenics, it is very difficult to engage in an argument with.