Was an advanced civilization lost to history in the global cataclysm that ended the last Ice Age? In his book “America Before: The Key to Earth's Lost Civilization,” Graham Hancock, the internationally bestselling author, draws on the latest archaeological and DNA evidence to bring his quest to a stunning conclusion. We’ve been taught that North and South America were empty of humans until around 13,000 years ago, but new discoveries have radically reshaped this long-established picture and we know now that the Americas were first peopled more than 130,000 years ago—many tens of thousands of years before human settlements became established elsewhere. In this installment of “Leonard Lopate at Large” on WBAI, Graham Hancock discusses what his has uncovered about this unknown history.