In recent years, ramen has become a global phenomenon. Despite its humble beginnings as a street food -- or abroad, a college dietary staple -- innovators have elevated the food into an art, and the experience of a bowl into a kind of spiritual indulgence. We look at the latest offerings on the scene, visit a ramen school that trains chefs, and sample the latest innovations of the instant variety. Our guests offer insights they've gleaned from the many bowls they've enjoyed. Expect to leave hungry.