        Dale had managed a machine shop for years, and it had taught him one valuable lesson—never assume anything.  A drawing that was crystal-clear would be misinterpreted.  A foolproof machine wasn’t.  Engineers just made costlier mistakes than his janitor.  While it was likely that the aliens had just decided to wait a month to come back in order to study earth and calibrate their translator, assume they hadn’t.  In that case, the first order of business would be establishing communications.  This would be a simple prospect, since anthropologists did it all the time.  A few gestures of friendliness, a smile, hands held open, and boom!  Peaceful intent demonstrated.  Trade a few words back and forth, pretty soon we’re in business.  Dale smiled.  This was going to be tricky, but no problem.