Most airplanes in the world have vertical tails or rudders to prevent Dutch roll instabilities, a combination of yawing and sideways motions with rolling that looks a bit like the movements of a ...

Several days a week over the past month, Alon Sicherman has found himself sitting upright in bed at 4:45AM in a motel near a town called Poughquag, in upstate New York, asking himself the same ...