Origin of the name Helena: Cognate of the Greek HelenÄ, which is derived from the root ÄlÄ (light, torch, bright). The name is borne in Greek legend by the beautiful wife of the king of Sparta.Her abduction by the Trojan prince Paris sparked off the Trojan War. From A World of Baby Names by Teresa Norman.ognate of the Greek HelenÄ, which is derived from the root ÄlÄ (light, torch, bright). The name is borne in Greek legend by the beautiful wife of the king of Sparta. Her abduction by the Trojan prince Paris sparked off the Trojan War. From A World of Baby Names by Teresa Norman.
The motion of the wind and water, as well as the motion of the wheel or shaft, represents a form of mechanical energy. The source of animal power is ultimately the chemical energy contained in foods and released when digested by humans and animals.The chemical energy contained in wood and other combustible fuels has served since the beginning of history as a source of heat for cooking and warmth.n early source of energy, or prime mover, used by humans was animal power, i.e., the energy obtained from domesticated animals. Later, as civilization developed, wind power was harnessed to drive ships and turn windmills, and streams and rivers were diverted to turn water wheels (see water power).
Both plants and animals are about 18 per cent carbon. We're all made out of the insides of stars! Plants get carbon by taking carbon dioxide out of the air and breaking off the oxygen atoms, and animals (including people) get carbon by eating plants or other animals.Animals recombine the carbon with oxygen to make carbon dioxide, which is what you breathe out.And when plants and animals die, their bodies also gradually become carbon dioxide again. Most of what we use for fuel is made of carbon, too.Coal, gasoline, oil, and wood are all made of hydro-carbons. In the picture you can see leftover carbon dust pouring out of this truck that burns diesel fuel. It's this carbon pouring into the air that's causing global warming.oth plants and animals are about 18 per cent carbon. We're all made out of the insides of stars! Plants get carbon by taking carbon dioxide out of the air and breaking off the oxygen atoms, and animals (including people) get carbon by eating plants or other animals.