Math enthusiasts around the world, from college students to rocket scientists, celebrate Pi Day, which is March 14 or 3/14 — the first three digits of an infinite number with many practical uses. Many people will mark the day with a slice of pie — sweet,

Pi Day is March 14. Plenty of restaurants and pizza shops are offering deals for cheap or free pizzas and pies. Even more have deals for $3.14. As you sat in elementary school or junior high and your math teacher began introducing algebraic terms to your vocabulary,