For several reasons—about 730 of them, really—I'm at Raleigh/Durham Airport for a couple of hours between London and Chicago. Yes, a direct flight to Chicago today would have cost $730 more. Someday, we'll discover that airline pricing schemes actually tap into the deepest secrets of the universe; for now, I'll just scratch my head and sit at RDU until 5pm.
On the way out to London, I got a photo of a phenomenon I've seen many times but never documented clearly. You know how the planet is more or less spherical? Here's some proof:
You can see this if you fly about 15 minutes past the terminator between night and day. The dark-blue wedge with the point on the left and the wide part under the wingtip is the earth's shadow.