Researchers have begun exhuming remains from unmarked graves at a now-closed Florida reform school. Former residents of the school say brutal beatings were routine, and they believe many boys died as a result. At least 50 grave sites have been identified, and it is believed that there may be many more. Several families of boys who died there are demanding answers. From Mariana, Florida, NPR's Greg Allen reports that researchers hope to determine how many boys are buried there in unmarked graves and how they died.