Of all of the dumb things to worry about, some council on tall buildings has declared One World Trade Center to be taller than the Willis Tower in Chicago, after much controversy, even though the Willis has higher occupied floors. Compared to the Burj Khalifa it seems like an argument about who is the tallest short person. It also reminds me of one of our subwoofer discussions, where we worry about the difference between 123db and 126db of output at 30Hz.