Blog MarketingWhat if you could listen to millions of people--customers, employees, competitors, partners, even the media--as they candidly discuss your company, your products, and your advertising? And what if you were able to use this real, up-to-the-minute feedback to determine exactly what your customers want and how to improve your business... | | Atoms And Materials (Physics in Our World)JET AIRPLANES MADE their first appearance during World War II (1939–1945), almost 40 years after American inventors Orville and Wilbur Wright built and flew the first airplane. Although jet engines are powerful and efficient, early airplanes had to settle for slow, cumbersome propellers, driven by piston engines quite similar to automobile... | | |