Highways across the American Midwest flicker in and out at tiny towns and rest stops, like a map of connect-the-dots. Along a line north from Houston, half the country is plunged in darkness, except for the great western oases of Denver and Salt Lake City. And then there is Europe, awash in light. And the Middle East, with boats illuminating the length of the Nile River and oil-field fires burning in Saudi Arabia. It's amazing, and NASA stitched it all together in this video.