In 1781, there was this guy named James Watt that invented a Piston Steam engine. This was the first rotary engine created. This invention allowed engines to power a wider variety of things like tractors and locomotives (trains). Before this engine was created, many depended on flowing water to transport goods such as rivers and streams. Most engines were fueled by coal and wood. The …show more content…
Laser is actually an acronym that stands for “ Light Amplified by Stimulated Emission of Radiation.” The wavelengths of the laser are all the same and this makes the light strong over distances.
Laser have been introduced into the world and have become very important to scientific research, medicine and a normal everyday life. They are used to measure, map, and identify. They are also used in the industrial business. They are used to cut drill and weld things together. They provide help with medicine as well. They can scan an eye to see what kind of prescription it needs, and it could also cut a patient's skin during surgery without any pain.
There are also disadvantages of having lasers in our everyday life. For example, Laser guided bombs and missiles are living in this world as well. Laser guns are trying to be adopted by the militaries defenses. They would be used to blind enemy soldiers.
Although many technological advances are somewhat good for the environment, they also come with some downfalls. Not all lasers are safe. Steam engines provide a vast amount of pollution into the atmosphere. Every man-made product has a backfire at some