It's so hard to teach New Yorkers," says
columnist John Tierney of The New York Times, lowering his binoculars
and shaking his head. "I try twice a week, and it never works." It's morning in
Manhattan's Riverside Park, and Tierney and I are standing near 89th Street,
spying on dog walkers on the promenade below us and counting how many leash their
pets upon leaving the enclosed dog run, as city law requires. We're in the
data-collection stage of a mock scientific experiment conducted for Tierney's
twice-weekly column "The Big City." Here is the protocol: