Since 1993, Joan R. Ginther has hit the lotto jackpot four times, to the tune of $2 million, $3 million, $5.4 million and $10 million.

The chances of this happening are one in 18 septillion. For a point of reference, there are about one septillion grains of sand on earth.

Now there are doubts whether Ginther — who happens to be a former math professor with a PhD in statistics from Stanford University — is simply just the world’s luckiest woman.

Experts believe that Ginther may have cracked the lottery’s algorithm which determines where winning scratch-off tickets are shipped.  Three of her wins — each in two-year intervals — were from scratch-off tickets she bought in the same mini-mart in the town of Bishop, Texas.

While the 63-year old is actually from the Bishop area, she has lived in Las Vegas since her run of lottery wins began, and may have been traveling back to Bishop just to buy lottery tickets.

[Daily Mail]