Today on Cause Talk Radio, Megan and Joe talk to Mason Wartman, owner of Rosa's Fresh Pizza in Philadelphia. Over the past several months, Mason has become a media darling for his efforts to feed the homeless in his neighborhood. He's even appeared on Ellen!

Like all great ideas, Mason's is simple but powerful. When customers buy a slice of pizza they can buy another for someone in need. Rosa's walls are lined with sticky notes and well wishes that the homeless can redeem for a free slice.

Since the program began last year, Rosa's has given away 11,000 slices in a neighborhood that needs all the extra dough it can get.