http://blogs.discovermagazine.com/80...damaged-heart/     Now, a new study in mice shows... When a pregnant mouse has a heart attack, her fetus donates some of its stem cells to help rebuild the damaged heart tissue. ... Doctors have observed that women who experience weakness of the heart during pregnancy or shortly after giving birth have better recovery rates than any other group of heart failure patients. This study suggests that fetal stem cells may help human mothers, as well as mice, recover from heart damage. It may also explain another curious clinical observation: The hearts of two women who suffered from severe heart weakness were later found to contain cells derived from the cells of a male fetus years after they gave birth to their sons.  The same thing seems to hold true for other organs. When pregnant women have damage in other organs, including the brain, lung, and liver, earlier studies have shown, fetal cells show up there, too.   Amazing, maybe this also explains why women on average live longer than men?... if they beared children they got their organs patched up during pregnancy?...    is there any statistics about life expectancy for women who never had children vs. women who did? maybe the number of children shows a correlation??