When you walk into Manhattan's Chinatown, the first thing you notice is the mix of smells in the air. You can smell food cooking on the streets, from steaming dumplings to sizzling woks full of stir-fried vegetables and meats. Chinatown has grown from a small neighborhood for Chinese immigrants into one of the most exciting food destinations in New York City. But how has Chinatown food in Manhattan changed over the years, and why do people keep coming back for more?