Computer chips have changed our way life. With computer chips we can make very small computer. Space scientists use these small computers in satellites and space ships. Large companies use these small computers for business. We can make very small calculators with computer chips. Some calculators are not very expensive. Computer chips are also used for making digital watches. A normal watch has a spring and moving hands, but a digital watch has no moving parts. A digital watch shows the time and the date with numbers, and some digital watches even have an alarm and a stop-watch. The computer chip makes all of this possible.What the main idea of this paragraph?