Sign language -- it's been around for almost 400 years and still is used today by deaf people around the world. It also is being studied by hearing people. Whether their interest is learning a new way to communicate or simply to gain high school credits, many hearing students are taking sign language classes each year. Sandra Delph is a free-lance sign language interpreter who also teaches America

Sandra Delph's job requires her to be on call 24 hours a day and to drive more than 40,000 miles a year. But she loves it. "The best part is the feeling of public service, I think, and caring about people and being able to interact with them," she said. Delph is a sign language interpreter for the deaf. She's been signing for 17 years but became a full-time interpreter four years ago. She was insp