It might seem unusual for a woman to have two uteruses, but the condition known as uterine didelphys occurs in about one in 1,000 women. In fact, Hannah Kersey, her mother and her sister all have two wombs. But Hannah made history in 2006 when she gave birth to triplets -- a set of identical twin girls from one womb and a third, fraternal sister from the other womb. There have been about 70 known pregnancies in separate wombs in the past 100 years, but the case of triplets is the first of its kind and doctors estimate the likelihood is about one in 25 million.
For another interesting list, check out 16 Unusual Facts About the Human Body.
Helen Davies, Marjorie Dorfman, Mary Fons, Deborah Hawkins, Martin Hintz, Linnea Lundgren, David Priess, Julia Clark Robinson, Paul Seaburn, Heidi Stevens, and Steve Theunissen