Food comes to us from a lot of places on the planet. But we assume most of those places are actually in the business of agriculture, not, say, the sidewalks of Oakland, California.
But Oakland is exactly one of the places where researchers found edible greens growing wild. And even though some of the surroundings--residential and industrial--were a bit bleak, the plants didn't seem to care.
Even plants grown in soil with potential contaminants could be washed and safely eaten. Philip Stark, the principal sidewalk salad investigator, visits with details of the work.