CLICKING THROUGH THE LATEST VERSION OF David Macaulay’s ““The Way Things Work’’ isn’t like listening to some know-it-all professor; it’s like strolling with someone who simply notices more than you do. This illustrated encylopedia of science and technology compensates for its lack of depth with Macaulay’s inspired pen-and-ink 19th-century artwork and his whimsically affable observations. So why do hot-air balloons rise? Click and watch an animation bring the principles to life. Macaulay on Macaulay: ““I don’t draw to produce finished drawings. It’s about studying and seeing.’’ And here, seeing is believing.