Nikola Teslaâs invention of the laser may be one of the best examples of the good and evil bound up together within the mind of man. Lasers have transformed surgical applications in an undeniably beneficial way, and they have given rise to much of our current digital media.
by Demand Media. Special fountain tints or dyes are used to turn water blue. While the color blue is often used to to depict or represent water, in reality, blue is only a reflection of the atmosphere around it -- the sky above, when dealing with natural bodies of water, or a swimming pool's walls, which are often painted a shade of blue or aqua.
Until the late 19th century most fountains operated by gravity, and needed a source of water higher than the fountain, such as a reservoir or aqueduct, to make the water flow or jet into the air. In addition to providing drinking water, fountains were used for decoration and to celebrate their builders.