Why are there so many chicken bones on the street? (Part 2)

This week, the shocking finale of our investigation into who -- or what -- has been leaving chicken bones strewn across the sidewalks of American cities. Our team of investigators returns with surveillance footage, and a recording of a superintendent with a rat-hitting stick. Plus, an exclusive interview with a public servant with a vision for a revolution in American urban trash collection.Check out Manny, Noah, and Devan online.And if you'd like to support Search Engine, you can sign up for our newsletter here.