Occasionally we post stories of turtles that have grown moss on their backs, or a turtle that emerges from hibernation carrying a slab of sod on its shell. These posts always reference Terry Prachett's Discworld, in which a turtle carries Discworld on its back. That idea was based on an old Hindu story in which the world rests on the backs of four elephants standing on a turtle. There are similar cosmology stories in Native American mythology, without the elephants. These tales work because a turtle's back looks like an island in the water -and they really do carry sod on their backs from time to time. But they don't work with gravity as we understand it today, so the question becomes, "What is the turtle standing on?" Well, another turtle, who is standing on another turtle, and it's turtles all the way down, like that one scene from Yertle the Turtle. The phrase has even found its way into the NeatoShop. In this video, Dr. Moiya McTier goes over the various ancient tales and how we got the catchphrase "Turtles all the way down." -via Laughing Squid