How to escape a desert

Today I learned something that might be useful, if I'm ever stuck in the desert with a broken down vehicle. If you want to signal to a rescue aircraft, one way is to shine a mirror at it. But it's hard to be sure that you're pointing the mirror at the right angle. So here's what you do: stretch one arm out, pointing towards the plane, with your index and middle fingers making a V. Then hold a mirror in your other hand and shine it so the reflected light shows on your fingers. Now you've got a pair of sights that you can use to aim the reflected light from the mirror at any spotter. Very handy, although I'm not planning on going wadi-bashing any time soon. (I do so hope that means driving a 4x4 over sand dunes, and not some sort of racist violence.)