The Lost Worlds of Planet Earth Ortelius hypothesized the idea that land masses may have been connected in the past, Alfred Wegener who hypothesized the idea of a super-continent Pangaea and continental drift despite the prevailing idea of flooded land-bridges at the time, and Bruce C. Heezen and Marie Tharp who discovered the Mid-Atlantic Ridge that supported the theory of plate tectonics. Tyson describes how the landmasses of the earth lay atop the mantle, which moves due to the motion and heat of the earth's outer and inner core. Tyson moves on to explain the asteroid impact that initiated the Cretaceous–Paleogene extinction event, leaving small mammals
The One After the Superbowl after Super Bowl XXX was made by NBC in hopes of making that Sunday the "highest-grossing ad-revenue day in television history." The guest stars were cast to draw more viewers and further increase the advertising revenue. In past years, networks had "exploited" the post-Super Bowl time slot to launch new series. NBC made an exception with "Friends" because they believed it would attract more advertising revenue than a new show. Curt King, press manager for "Friends", commented: "Try to think of the new shows that were premiered after recent Super Bowls and name one that's still around. What we decided