How an 1836 Famine Altered the Genes of Children Born Decades Later

Why do some identical twins look so different from each other? Could your eating habits during puberty have an impact on the genetic makeup of your grandkids? These are just two of the startling questions raised by the science of epigenetics, as this "deleted" chapter from David Epstein's book The Sports Gene explains. » 8/26/13 8:00am 8/26/13 8:00am