On a blustery afternoon late last year, on the lawn just outside City Hall in Rowlett, Texas, a strange-looking craft cleared the trees just before me. It hovered overhead for a moment before lowering a second craft on a thin rope all the way to a parched patch of grass. The little, white thing deposited a brown paper payload, then rode its tether back up to its waiting mothership, which turned and left. The experience lasted less than 30 seconds. This wasn’t some UFO experience. This was a