Historian Bettany Hughes retraces the lives of three great thinkers whose ideas shaped the modern world: Karl Marx, Frederick Nietzsche and Sigmund Freud.
Born in the 19th century, they lived through a time when old certainties were breaking down. Regimes were overthrown by mass uprisings, science was undermining religious authority. Their challenge was to figure out what makes us human in a fast-evolving world.
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