Today, the vast majority of experts can largely agree on the basics of human evolution, from the early days of the first populations migrating out of the African continent to the dawn of agriculture, the written word and, quite recently, industrialization. But what if this isn't the first time Earth was home to an industrialized society? Could it be possible that some other civilization rose -- and fell -- far before our own? Tune in to learn more about the Silurian Hypothesis. They don’t want you to read our book.