Did you know that it's possible to grow gourmet mushrooms on recycled coffee grounds? Learning that fun fact led Nikhil Arora and Alejandro Velez, then students at UC Berkeley, to conduct a series of experiments in the kitchen of Velez's fraternity house. They ended up with a bucket of oyster mushrooms and ultimately a new career path as full-time urban mushroom farmers. Their Oakland, California-based company, Back to the Roots, sells compact mushroom-growing kits and a fish tank/aquaponics system that grows herbs in its lid. "Our mission is to make food personal again," say Arora and Velez, "through the passionate development of tools that educate and inspire, one family at a time."