I blinked and looked again--but it was still out there, a shiny chrome disc zigzagging around in the sky. My eyes struggled to track the object through a series of increasingly fast, impossibly sharp turns that would have juiced a human being, had there been any aboard. The disc streaked toward the distant horizon, then came to an instantaneous stop just above it. It hovered there motionless over the distant tree line for a few seconds, as if scanning