Dr. C. Everett Koop, surgeon-in-chief at Children's Hospital in Philadelphia, talks about surgery that separated 13-month-old siamese twins, Clara and Alta Rodriguez, Sept. 19, 1974. (AP Photo/William Ingram)
Dr. C. Everett Koop, surgeon-in-chief at Children's Hospital in Philadelphia, talks about surgery that separated 13-month-old siamese twins, Clara and Alta Rodriguez, Sept. 19, 1974. (AP Photo/William Ingram)