WASHINGTON - First came the Internet in the late1960s, electronically linking computers around the world. The `90s brought the World Wide Web, making it possible to exchange words, pictures, music, videos and information of every sort. Now comes the Grid, a third wave in the evolution of the cyberworld that promises to give users access to unprecedented computing power, services and data no matter where they are located. Ultimately, supporters say, the Grid will be like having a supercomputer at your fingertips. Astronomers in Massachusetts and California could share the same telescope in Hawaii without leaving their offices. A travel...