A Mysterious Patch Of Light Shows Up In The North Dakota Dark

"This is odd. Take a look at this map of America at night. As you'd expect, the cities are ablaze, the Great Lakes and the oceans dark, but if you look at the center, where the Eastern lights give way to the empty Western plains, there's a mysterious clump of light there that makes me wonder."

Mind-blowing. If you think you know what it is, check out this NPR post. (Thanks, Claire)