Search All NYTimes.com. Anne Wolf Cochran, a daughter of Mr. and Mrs. James A. Cochran of Falls Church, Va., was married yesterday to William Charles Hamilton, the son of Mrs. Joseph S. Iseman of Rye, N.Y., and the late William H. Hamilton.
1 Conjoined twins occur in approximately one in 50,000 births, and the majority do not survive (they are stillborn).
1 The chances of having identical twins is about 1 in 285 or 3.5 per 1000 maternities.  The Yoruba tribe of Nigeria have the highest twinning rate in the entire world (3 sets of twins in every 19 births). The Nigerian people attribute it to their population's consumption of a specific type of yam.