… up for and start using a cellular phone. Therefore it is likely that you or someone you know has a cell phone and uses it on a regular basis. They are such great gadgets - with a cell phone you can talk to almost anyone from just about anywhere,…

… network, linked from city to city, state to state and base to base. No matter how thoroughly that network was armored or protected, its switches and wiring would always be vulnerable to the impact of atomic bombs. A nuclear bombardment would reduce…

… to separate and identify the lower density particles in a homogenous mixture. Thus, the objective of the exercise was to realize that there is more than one structure in the cytoplasm and to isolate them using homogenization and differential centrifugat…

… table. It’s atomic number is fifty-eight, which means it has fifty-eight protons and electrons. It has an atomic mass of 140.12, giving it eighty-two neutrons. Cerium is a soft, iron gray metal of the rare earth group of chemical elements, also called…

… of the brief flight of the Challenger that took place on January 28, 1986 was not an “accident”. By definition, an accident is “an unexpected, undesirable event”. The violent loss of one human life was in this case, an “accident”. Not only were…

… the earth’s weather and climate, and heats the earth’s surface; in turn, the earth radiates energy back into space. Atmospheric greenhouse gases (water vapor, carbon dioxide, and other gases) trap some of the outgoing energy, retaining heat somewhat…

… whom Charles R. Drew University of Medicine and Science in Los Angeles is named, was a brilliant black physician, famous for his pioneering work in blood preservation. Born in Washington, D.C. on June 3, 1904, his life ended in an automobile accident…

… of everyday life in ways we do not experience today. Some societies, such as the Greeks and India constructed cultural ideas and institutions to deal with violence. While some accepted it in and made it part of their cultural ideals, others tried…

… warfare is the use of natural or synthetic substances to disable or kill an enemy. It is also used to prevent them from using resources such as agricultural products or foliage in which to hide. Why use chemical weapons? Because of…

… to be chemical substances, whether gaseous, liquid, or solid, which might be harmful because of their direct toxic effect on human, animals, and plants. A chemical agent is a chemical substance, which is intended for use in military operations to…