The mysteries of endometriosis

This common chronic condition — where tissue similar to what grows
inside the uterus grows elsewhere in the body — is barely
understood. So why is a condition so prevalent and painful still so
unknown? It has a lot to do with who gets to ask research
questions. Correction, August 18: An earlier version of this
episode implied that the tissue involved in endometriosis is the
same as the endometrium, which lines the uterus. It is similar
tissue, but not identical. For more, go to
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