|Photo: The Sun|
According to The Sun, the 18-year-old twins are believed to be one of only four sets of dicephalus twins ever to survive into teen years.
The Hensels have two spines, which join at the pelvis, two hearts and stomachs, three kidneys, two gall bladders and four lungs.
But they share one liver, ribcage, a nervous system and all organs below the waist including intestines, bladder and reproductive organs.
Each twin controls one side of the body and they can play the piano, swim, ride a bike and take part in sport activities.
Both Abigail and Brittany have even passed their driving test with each sister using one arm to control the steering wheel.
Despite the doctors' warning to their parents, nurse Patty and carpenter Mike, that their girls may not survive their first night on March 7, 1990, the twins have grown up to live an active life.
Only one set of twins in every 40,000 is born connected in some way and only one percent of these survive beyond the first year.
Doctors are worried that Abigail and Brittany will eventually suffer heart or other organ defects.
But none has shown so far and the twins even hope to marry one day.
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