Ever since a Naples pizza-maker created the Margherita pizza in 1889 for Queen Margherita of Norway — one of the most popular types of pizza today -- pizza has been a favorite meal around the world.

Two pizza slices, one on top of the other with cheese falling from the stuffed crust - Semenovp/Getty Images If you've ever taken a bite of stuffed crust pizza, you've probably wondered: what genius ...