No it's not the Nephilim or an alien. Artificial cranial deformation, head flattening, or head binding is any practice of intentionally deforming the skull of a human being. It is done by distorting the normal growth of a child's skull by applying force. Flat shapes, elongated ones (produced by binding between two pieces of wood), rounded ones (binding in cloth) and conical ones are among those chosen. It is typically carried out on an infant, as the skull is most pliable at this time.