Shinya Yamanaka from Kyoto University was named the winner of the Nobel Prize in Physiology or Medicine for discovering how mature, adult cells can be reprogrammed into immature stem cells. Shizuo Kambayashi/Associated Press hide caption

itoggle caption Shizuo Kambayashi/Associated Press

Each of these mouse pups was born from an egg scientists created using embryonic stem cells. It's possible the technology could change future treatment for human infertility. Katsuhiko Hayashi hide caption

itoggle caption Katsuhiko Hayashi

The white arrows in these two tumor samples point to a subset of tumor cells that are in a resting state. Nature hide caption

itoggle caption Nature

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