Unbelievable but true... A human without a body...
They are two twins joined by the head. Only difference is the the second twin (called "parasitic" twin in the documentary) has no body.
Even though the "head-only" twin shares part of her brain with her sister she does seem to have a consciousness of her own with a distinct personality. She can smile and reacts to her environment (follows people and objects with her eyes). For obvious reasons (lack of throat and lungs) she can of course not speak.
The "head-only" twin was feeding her brain off her sisters blood directly (so her sister's body had to pump double the amount of blood to the heads). I wonder, would she feel hunger? Or would her sister feel hungry for her instead? (since she is the one who can actually eat and digest)
How is it even possible to have fused brains yet different personalities? (and does that say anything about people with multiple personality disorder?Or is that taking it a step too far?)
Fortunately/Unfortunately we wont know the answers.
To save the life of the twin with the body the mother and doctors decided to separate the two.