plate techtonics, and maybe we're in a period where pacific plates have decided to make a major lurch forward, so to speak, causing many of these major earthquakes to occur around the rim. >> something i know you have certainly will be studying there as a geology professor at uc davis. >> we are. >> more on the potential nuclear crisis in japan. how serious is it, and how much worse could it get? by the sea powered by the wind on the plains. there's a hospital where technology has a healing touch. there's a factory giving old industries new life. and there's a train that got a whole city moving again. somewhere in america, the toughest questions are answered every day. because somewhere in america, more than sixty thousand people spend every day answering them. siemens. answers.