When it first aired in 1983, the NOVA program "Miracle of Life" was hailed as revolutionary. Famed Swedish photographer Lennart Nilsson's stunning endoscopic images of life inside the womb opened up a hidden world that few had ever seen. "Life's Greatest Miracle" showcases Nilsson's most recent photography while at the same time touching on the latest advances in our understanding of fertilization and embryonic and fetal development.