For years, people who dream of beating the lottery have puzzled over the amazing case of Joan Ginther, who made headlines around the world by scratching off "10MILL" on a $50 instant ticket in June 2010 to win her fourth multimillion-dollar prize. 

Skeptics wondered if she cheated or had an ingenious system for pinpointing winners. After all, Ginther received a Ph.D. from Stanford and has lived for years in Las Vegas. News reports at the time, citing mathematicians, fueled the fire: They put her chances of four such wins at 1 in 18 septillion. Remarkably, all four of her winners were purchased in or near her tiny hometown of Bishop, Texas.