Buzzard shrugged. "What do you mean, ‘real’? The Hum drives people nuts, sometimes. Is that real enough for ya? Maybe it’s not a real sound. Maybe it’s some disturbance inside the ear, some kind of resonant power harmonic off the bottom of the ionosphere, or something.... Some people can hear the northern lights, they say; they hear ’em sort of hiss and sparkle when the curtains move. There’s no explanation for that, either. There’s a lot we don’t understand about weather." Buzzard clutched the lump of blackened metal on the leather thong around his neck. "A lot , man."