Say what you will about Bill Gates, but the Microsoft chairman is undoubtedly a valuable spokesman for science and technology education in this country. Speaking before the House of Representatives' Committee on Science and Technology yesterday, Gates reiterated comments he made last year; telling lawmakers that the U.S. needs to revamp its education program, and make it easier for qualified foreigners to work here. Otherwise, he warned, U.S. companies will not have the science and engineering talent they need to compete on the global scale.