This episode's headline: Miracle Babies; Fostering Adoption; Picking a Union; Winning Authors. ANCHOR: JIM LEHRER; GUESTS: DR. MARIAN DAMEWOOD, American Society for Reproductive Medicine; DR. TIA POWELL, Columbia Presbyterian Medical Center; JUDGE WILLIAM BYARS, 5th Circuit, South Carolina;GLORIA KING, Black Adoption Research Center; JOSEPH ELLIS, Author, ""American Sphinx""ROBERT PINSKY CORRESPONDENTS: PHIL PONCE; ELIZABETH FARNSWORTH; DAVID GERGEN; ROD MINOTT;