On a white restaurant tablecloth in San Francisco, under the glow of a stained-glass dome ceiling with images of laurels, fleurs-de-lis, and a ship, rested a portion of metal the size of a shallot.

One of the world's most revered UFO experts claims the beings behind UFO phenomena are not just observing us but are in fact killing innocent people. Jacques Vallée, a man whose six-decade career has ...