October 31, 1517: Martin Luther posts his 95 Theses in Wittenberg (see issue 34: Luther's Early Years).

October 31, 1825: George Muller, who founded orphanages that would house more than 10,000 orphans by his death in 1898, converts to Christianity at a Moravian mission.

October 31, 1992: Pope John Paul II formally admits the Roman Catholic Church's error in condemning Galileo Galilei in 1633 for believing the sun, not the earth, was the center of the universe (see issue 76: Christian Face of the Scientific Revolution).