May 9, 2013 — Scientists used to think that identical twins turned out differently because they were treated differently by friends, teachers or their parents. A study of mice supports the idea that small changes in behavior can lead to larger ones and eventually even resculpt brains in different ways.
Jan 12, 2012 — British researchers say the time has come to buckle down on the number of embryos used during in-vitro fertilization. Three or more is entirely too many, they concluded after looking at data on more than 124,000 IVF treatments.
Jan 4, 2012 — The number of twins being born in the United States more than doubled between 1980 and 2009, federal statistics show.