Why was North America once covered in ice? How could a comet strike have helped to shape our planet as we know it? And What did stone carvings teach us about our early human ancestors? Join Guy Raz & Mindy Thomas as they take you on a time traveling adventure through the latest Who, What, When, Where, Why, How and WOW in the World!See Privacy Policy at https://art19.com/privacy and California Privacy Notice at https://art19.com/privacy#do-not-sell-my-info.