Pope Benedict XVI ushered in Easter services late Saturday with a dramatic, candlelit vigil in St. Peter's Basilica, saying Christ's resurrection was "the most crucial leap" in the history of mankind.The bells of St. Peter's tolled across Rome as midnight approached to herald in Easter, when the faithful celebrate the resurrection of Jesus after his crucifixion on Good Friday.This year, Easter Sunday also coincides with Benedict's 79th birthday.At the start of Saturday night's lengthy vigil, Benedict entered the darkened basilica in silence, holding in front of him a single white candle. Its flame was then shared with others until slowly...