Palaeobiologist and bestselling author Thomas Halliday is helping us better understand how the natural world evolved over the past 500 million years. His recent book, Otherlands: A World in the Making, guides the reader through a series of ancient landscapes from the dawn of complex life 500 million years ago to up to the birth of humanity and uses Halliday's immersive storytelling combined with sharp scientific analysis to bring the journey to life. Hosting this discussion is science writer and broadcaster, Gaia Vince.

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