Lou and Brian travel to Wisconsin's Henning's Cheese Factory to understand how cheddar cheese gets its distinctive flavour. There, they find a microscopic world of enzymes and bacteria. Then the guys run over to New Balance in Lawrence, Massachusetts to get a custom-fit running shoe that perfectly balances cushioning and stability. Finally, our hosts build a Steinway piano on Long Island, doing everything from shaping the wood to helping rig the piano's 230 strings