When the Hensel twins were born in 1990 they caused quite an uproar. Not only were their parents expecting just one lovely little girl and they had two, but the girls were a very special set of twins. Born one in every 50,000 births, the Hensel twins were conjoined. Medical professionals at the birth were impressed that not only where the girls alive, but seemed to be relatively healthy. They didn't need to immediately be separated to save one or other of the girls, and functioned mostly like normal.
Surprise Twins!

Brittany and Abby Hensel were definitely a surprise. While their parents were expecting one baby, they had no idea what was in store for them. Born on March 7th, 1990, in Carver County, Minnesota, the girls were cause for excitement from the moment they arrived. Not only were they twins, but they were conjoined!
1 Body, 2 Heads

Brittany and Abby are dicephalic parapagus twins, meaning they have separate heads on one body. They are also highly symmetric, with normal proportions for their arms and legs. They share a torso but have their own spinal cords, lungs, spines, stomachs, and hearts. They also each control one arm and one leg.
Beating The Odds

While many conjoined twins do not live past infancy, Brittany and Abby seemed determined to beat the odds. Their parents decided not to try and have them surgically separated as the risk of losing one or both of them was so great. They have suffered health issues over the years, but they've continued to survive and thrive.