Dorothy Roberts carefully sets one slipper-clad foot in front of the other. She cradles both ends of what looks like a large, white, plastic wishbone in her palms, and as she covers the asphalt of a Boca Raton parking lot, the instrument begins to dip. She nudges a fallen sapodilla with her foot to mark the spot and continues with her search. When she reaches a fire hydrant, the rod points straight to the ground. "You can't stop it," she says. "Even if you try, its... More >>>