This week "Sunday Morning," with guest host Lee Cowan, features David Pogue's cover story on the next generation of GPS satellites. Plus: Cowan profiles the Shriners Hospitals for Children spokesperson Alec Cabacungan, a 17-year-old patient with a rare genetic disorder called osteogenesis imperfecta; Seth Doane meets Ruth Coker Burks, whose compassion for AIDS patients in Arkansas earned her the nickname "The Cemetery Angel"; Tracy Smith talks with Sir Anthony Hopkins and Jonathan Pryce, stars of the new movie "The Two Popes"; Serena Altschul meets an entire family of models; and Luke Burbank goes behind the scenes of the new Broadway musical "Jagged Little Pill," inspired by Alanis Morissette's landmark album.
