A moment in time. It's rare for a person to remember exactly where he or she was at a single moment in time, some four decades past. It's rarer still for an entire nation to hold a collective memory of such a moment. This kind of hardwired retention usually results from group trauma - the shock of assassination, large scale tragedy, or natural disaster. Occasionally, the event that galvanizes a population is a happy one. Such was the case when Paul...