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As America takes steps to improve our energy security, home-grown fuel sources are more important that ever. One of the fuel sources of the future is algae, small aquatic organisms that convert sunlight into energy and store it in the form of oil. Scientists and engineers at the Energy Department and its national laboratories are researching the best strains of algae and developing the most efficient farming practices. This edition of Energy 101 shows how oil is extracted from algae and refined into sustainable biofuels.