On the coast of Northern Ireland, a vast plateau of basalt slabs and columns called the Giant's Causeway stretches into the ocean. The scientific explanation for this is that it's the result of molten lava contracting and fracturing as it cooled in the wake of a volcanic eruption. But an ancient Irish myth has a different accounting. Iseult Gillespie recounts the Giant's Causeway myth. [TED-Ed Animation by Dylan Glynn]