"And that is true in 85 percent of kids; it's kids who live in old, dilapidated, mostly urban housing. But that still leaves 15 percent of the cases that occur in middle- or upper-class families, usually associated with home renovations. People are sanding paint, removing banisters, cleaning up windowsills, and they don't realize that they're spewing lead dust around in the house. And then the kids get it."