tears. pl n. 1. (Physiology) the clear salty solution secreted by the lacrimal glands that lubricates and cleanses the surface of the eyeball and inner surface of the eyelids. 2. a state of intense frustration (esp in the phrase bored to tears). 3. in tears weeping.
Nuclear power is energy which is produced with the use of a controlled nuclear reaction. Many nations use nuclear power plants to generate electricity for both civilian and military use, and some nations also utilize this type of energy to run parts of their naval fleets, especially submarines.
The Sun is a natural fusion reactor, using stellar nucleosynthesis to transform lighter elements into heavier elements plus energy. Fusion power is energy generated by nuclear fusion, or more broadly, the use of that power as an energy source. Fusion has a number of advantages over fission as a source of power, including reduced radioactivity, ample fuel supplies, and increased safety.