Scientists obtained menstrual blood from nine women and cultivated it for about a month, focusing on a kind of cell that can act like stem cells.
Some 20 percent of the cells began beating spontaneously about three days after being put together in vitro with cells from the hearts of rats. The cells from menstrual blood eventually formed sheet-like .
Take that, period-haters. I can repair a human heart with my blood. What can you do?