While talking with the media outside the Exciting Idlewild Baptist Church in Lutz, Fla., on Sunday, former House Speaker Newt Gingrich called for a commission to look at new rules for clinics that perform in vitro fertilization. Matt Rourke/AP hide caption

itoggle caption Matt Rourke/AP

Dr. Paolo Macchiarini, of Karolinska University Hospital, implants a synthetic windpipe. Karolinska Institute hide caption

itoggle caption Karolinska Institute