... Whenever I am out with Margaret, I'm conscious that she represents a group whose ranks are shrinking because of the wide availability of prenatal testing and abortion. I don't know how many pregnancies are terminated because of prenatal diagnoses of Down syndrome, but some studies estimate 80 to 90 percent. Imagine. As Margaret bounces through life, especially out here in the land of the perfect body, I see the way people look at her: curious, surprised, sometimes wary, occasionally disapproving or alarmed. I know that most women of childbearing age that we may encounter have judged her and her...