The tour boat that capsized drowning 20 elderly tourists in upstate New York last year turned out to be licensed to carry 50 people and had only 48 on board. And yet one of the reasons that it capsized was that it was grotesquely overloaded. It seems that things have changed since the 1960s when they measured average weights of people and applied them to estimates of passenger limits. Today's bodies are much, much heavier - the young are taller and most everyone is fatter, often to the degree of obesity. The capacity estimates now are outdated and dangerously wrong - by an average 25 lbs per person. Something we need to bear in mind when we step into an elevator!