"Nuclear fission" refers to a process where the nucleus (central part) of an atom splits into two smaller parts, releasing a large amount of energy. Full definition
There are various types of nuclear fission reactors. (climate.uu-uno.org)
Because it is our generation that will benefit from the wealth produced by nuclear fission reactors, all our heirs will receive is our radioactive garbage. (religion-online.org)
To illustrate chain reactions in nuclear fission, a table filled with mousetraps represents the atoms and pingpong balls stand in for the new neutrons created from the split. (dvdizzy.com)