Like everyone else, George Huber knows money doesn't grow on trees. But, ask him where gasoline comes from and he won't just tell you, he'll show you. To fully understand, Science Nation recently went with Huber to a local lumber yard in Amherst, Mass. A lumber yard is the perfect place to find cellulose, the key building block in plant cells and the organic material that gives plants their structure. So what does cellulose have to do with gasoline? A lot.