MODERN SCIENCE THEATER: The U.S. Navy Research Lab has come up with an alternative fuel source for its battleships. The lab is trying to cut back on its use of petroleum, because of the limited quantity. So, in order to continue growing, the lab has decided to start using fuel produced by seawater. The call for change comes after predictions of competition between the U.S. and Chinese Navies. In order for the U.S. Navy to assert its presence, it needs to expand its fleet in the Asia-Pacific region.