There's no exact formula to get kids excited about math, but the sleek, new two-floor Museum of Mathematics (MoMath)—the only cultural institution devoted to math in all of North America—comes close to finding the perfect ratio of fun-to-math. Kids can ride square-wheeled trikes, create human fractal trees, build virtual 3-D geometric shapes (which can be printed out on a 3-D printer), use lasers to explore cross-sections of objects, solve dozens of puzzles, and just generally bend their minds while they unknowingly multiply brain cells (sshh!). Kids will need closed-toed shoes for the Square-Wheeled Trikes. Exhibits are best suited to kids ages 6 and up but preschoolers will still enjoy many of the interactive exhibits, like the Math Square—a light-up floor programmed with math games, simulations, and patterns. The museum closes at 2:30 pm the first Wednesday of every month.