I would like to start with an anecdote. When my daughter was five weeks old, she had a stiff neck, and almost couldn't turn her head at all to her left. So, my wife and I went to see an osteopath. The doctor's practice was a family business: father and son—both of them neurologists and chiropractors—work on scores of bodies day by day, manipulating and treating them. The father is also an osteopath; the son is still learning to become one. We saw the son. He treated our daughter who screamed and turned red and in turn got her back straightened, but not quite as straight as it should have been. So, the son got his father, who showed him another trick or two, explained them to his son and to us, and left again. Our daughter was now really aligned, and the son said: “Well, this is how it goes. I am still learning. While I push and pull and push and pull, my father just needs one grip and the work is done.” Our daughter sneezed. “Do we need to come back?” we asked. “No, one time is sufficient. Good-bye,” he replied and left for his next patient.