I recently invented a prototype high tech device called the Neg-O-Meter. The Neg-O-Meter operates much like a Geiger Counter only instead of measuring radiation, it measures human negativity.
I used a Homeland Security approved bungee cord to attach my Neg-O-Meter to a radio controlled drone which I flew over the entire city to determine where the strongest source of negative attitudes radiate from. I did not fly my drone over the kids playing soccer at Ft. Steilacoom Park, because it is dangerous and besides, kids playing soccer are not going to be negative.