Social stress is known to have adverse health effects on both humans and primates. Now, researchers report that it also affects the immune system of female rhesus macaques at the genetic level.

The answer, according to a new study of twins, is, for the most part, "no." While sequencing the entire DNA of individuals is proving fantastically useful in understanding diseases and finding new treatments, it is not a method that will, for the most part, predict a person's medical future.