SAN DIEGO (AP) _ Robert Klark Graham, who believed intelligence could be bred and established a sperm bank that originally accepted sperm only from Nobel Prize winners, died Thursday. He was 90.

Graham died in Seattle at the meeting of the American Association for the Advancement of Science. He was found in his hotel room bathtub after hitting his head in a fall, said his wife, Marta Everton Graham.

Graham was also a renowned optical physicist who developed shatterproof eyeglass lenses.

His Repository for Germinal Choice takes credit for fathering more than 212 children since it opened in 1980 in Escondido, north of San Diego.

By the 1990s, the center accepted sperm from nonscientists. Researchers scoured Who's Who and other publications, searching for accomplished men who had IQs of at least 140.