Is the price of gasoline taking a toll on your wallet? Make your drive greener and more fuel efficient with the help of lasers. Everything else about an automobile is being retooled to be leaner and greener, so it was only a matter of time before spark plugs got a second look. While they might seem like an essential component for ignition, a group of Japanese researchers think their lasers can do a better job. "If you want save gasoline, cut CO2 and [emissions] with more power, new ignition should be required," said Takunori Taira, an associate professor of laser...