ne day about seven months ago, I was standing in a dark room in a hospital not far from Tel Aviv, performing an ultrasound on the taut belly of a woman well into her third trimester. She was 35 weeks pregnant, due in about a month. She and I felt the fetus kick, right under the ultrasound probe. “Strong one!” I said in Hebrew. She smiled. I managed to freeze a sweet picture of the bow-shaped fetal upper lip, and pressed “Print,” to give to her later. ... At that point, I needed to tell her about that small head...