NEDERLAND, Colo. - Michelle Jorgenson thought it was odd that her 8-year-old daughter Cheyenne — conceived with sperm from a mystery man known to Jorgenson only as Donor 3066 — was extremely sensitive to sound and walked on her toes. Jorgenson started checking on the Internet and soon learned of at least six other children around the country who were fathered by 3066. And of those seven, she discovered to her alarm, two have autism, and two others, Cheyenne included, show signs of a sensory disorder tied closely to autism. The children's mothers located one another beginning a year ago...