By Fr. Richard Heilman - It was Mary’s final appearance, on Oct. 13, 1917 (exactly 33 years, to the day, after Pope Leo XIII’s vision), that became the most famous. An estimated 70,000 people were in attendance at the site, anticipating the Virgin’s final visit and with many fully expecting that she would work a great miracle. As everyone gazed upward, and saw that a silvery disc had emerged from behind clouds....