Believe it or not, three companies in the world build machines that can simulate earthquakes. They are Mitsubishi and Hitachi - both located in Japan - and MTS Systems Corporation, located in the geologically stable town of Eden Prairie, Minnesota. MTS recently upstaged its competition by selling a 24-million dollar machine - its largest earthquake simulator ever - to the Japanese government. Scientists will use the machine to simulate the quake that devastated the city of Kobe in January, 1995, and then to run tests aimed at improving the design of buildings and bridges in Japan.