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 Legend That Was Earth to be a less drastic mix of Arthur C. Clarke's novel "Childhood's End" and the 2006 film "Independence Day". The Hyadeans possess superior intelligence and technology, and their rulers wish to use Earth’s resources. However, their alien characteristics are not as foreign as the aliens’ in the aforementioned works. Hyadeans are basically discolored, chunky, pragmatic humans. Their skin colors range from dark-blue to pink and they are very tall and thickset. They also in general do not act upon emotion. Decisions are almost always based on self-interest; Hyadean visitors on Earth are amazed at Terran generosity and religions. Interaction, aside