I wonder how that relates to the study that poor kids hear less words than their richer peers (http://www.npr.org/2011/01/10/132740565/closing-the-achievement-g

I wonder how that relates to the study that poor kids hear less words than their richer peers (http://www.npr.org/2011/01/10/132740565/closing-the-achievement-gap-with-baby-talk http://www.npr.org/2011/01/10/132740565/closing-the-achievem...).