Shamahl Nolan, top, heads up the Mount Diablo school district’s infant program for babies 3-18 months who are deaf or hearing impaired, looks into a
Shamahl Nolan, top, heads up the Mount Diablo school district's infant program for babies 3-18 months who are deaf or hearing impaired, looks into a tunnel at two infants trying to crawl through, inside her class at the Robert Shearer Preschool in Pleasant Hill, Calif., Thursday, March 21, 2013. (Dan Rosenstrauch/Staff)