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 switch in time that saved nine The switch in time that saved nine "The switch in time that saved nine" is the name given to what was perceived as the sudden jurisprudential shift by Associate Justice Owen Roberts of the U.S. Supreme Court in the 1937 case "West Coast Hotel Co. v. Parrish". Conventional historical accounts portrayed the Court's majority opinion as a strategic political move to protect the Court's integrity and independence from President Franklin Roosevelt's court-reform bill (also known as the "court-packing plan"), which would have expanded the size of the bench up to 15 justices, though it has been argued that these accounts