It is usually embraced by math geeks or pizza and pie lovers.
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To celebrate "& Pizza" in Philadelphia is giving away two free weddings.
The couples are both from the Philadelphia area. Melissa Gandolfo and Jorge Velazquea will tie the knot, as well as Kate Boyle Steed and Nick Laffey.
The restaurant has done this at several of their franchises the past couple of years.
It provides the flowers, wedding cakes, and, of course, the pizza.
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READ MORE: National Pi Day deas and freebies