Thomas Wallace of the Enzyme Development Corporation empties an analytical sample from a tank where corn is being converted into ethanol inside the Lincolnway Energy plant in the town of Nevada, Iowa, December 6, 2007. The company, one of a growing number across Iowa and the United States, converts corn to fuel ethanol to be used in flexible-fuelled vehicles as an alternative energy source to oil. The business operates around the clock seven days a week, processing approximately 50,000 bushels (1.27 tonnes) of corn daily, and creating 150,000 gallons (567,752 litres) of ethanol per day. REUTERS/Jason Reed (UNITED STATES)