2066 Crist Drive, Los Altos, California: When he was in eighth grade, Steve Jobs, later the co-founder of Apple Computer, telephoned William Hewlett, president of Hewlett-Packard. "Bill answered, and I said, 'Hi, you know, uh, I'm 12 years old and I'm trying to build a frequency counter,' " Jobs recalls. Hewlett, a symbol of entrepreneurial success in the Santa Clara Valley, chatted graciously wit