This week we're exploring the world of seeds: how they've become so successful, how they work, how humans depend on them, and what we still don't understand about them. We spend the hour with Thor Hanson, conservation biologist and award-winning author, about his book "The Triumph of Seeds: How Grains, Nuts, Kernels, Pulses, and Pips Conquered the Plant Kingdom and Shaped Human History".
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