Your project fascinates me. I am the mother of a now adult son who is hearing impaired and who is a graduate of Gallaudet. His wife is a deaf woman from S. Africa, who comes from a family whose deafness is hereditary. Our son's hearing impairment is from my having three-day or German measles when he was in the sixth week of gestation, but we have often wondered whether there was any deafness in previous generations. Congratulations on your good work, Marge!