“One body, two souls.” The incredible lives of conjoined twins Abby and Brittany Hensel

After 27 years of functioning in one body, the twins’ doctors still have little understanding of how two brains, which control one side of the body each, can co-ordinate themselves to do the actions and activities the twins can: write, get dressed, ride a bike, type on a keyboard, play the piano, and drive a car – or even simply walk – seamlessly.

But whatever the neurological explanation is, Brittany and Abby can function in their body with limited hindrance and astonishing accomplishment.