WASHINGTON: "Hola, Mama." What seems like an unremarkable greeting between mother and son was in this case anything but. Forty-two years ago, hospital workers took Maria Angelica Gonzalez' son from her arms right after birth and later told her he had died. Now, she was meeting him face-to-face at her home in Valdivia, Chile. "I love you very much," Jimmy Lippert Thyden told his mother in Spanish as they embraced amid tears. "It knocked the wind out of me. ... I was suffocated by the gravity of...