In this high-tech age, the economies of nations and individuals depend increasingly on creative engineering. A new Monitor column called Innovations will help alert our readers to significant developments in technology. The column will cover topics as personal as wrist TV sets and as socially important as robot-run factories. It aims to highlight major developments rather than confuse readers with a miscellany of tidbits or randomly selected news. The column will appear on a regular basis, starting today on Page 21.