Thinking Sideways: The Kensington Runestone

Discovered in 1898, the 200 lb Kensington Runestone is, as the name suggests, a stone covered in runes. What makes this stone so interesting is that it was found in Minnesota, USA. Though the authenticity of this out of place artifact has been hotly debated, if real, the stone provides evidence that in 1362, Scandinavian explorers would have been the "first" to discover the new world, almost 100 years before Columbus.