Though I'd driven by at least a hundred times, I'd never noticed an interesting geographic fact until Christmas Eve. On the northwest side of the Baltimore beltway, there are adjacent exits for Liberty Road (exit 18) and Security Boulevard (exit 17). Appropriately enough, Liberty Road is relatively narrow, but will take you most of the way to downtown Baltimore or (in the other direction) all the way to tiny Libertytown, a good 25 miles away, while Security Boulevard is very wide but less than two miles long and leads only to a huge mall and an even huger (is that a word?) Social Security Administration office complex. (Actually, it's been years since I've driven on either, so I hope Baltimoreans will correct any errors.)