Energy

From Slackerpedia Galactica

Energy is a very weird thing. There are many kinds of energy -- kinetic energy, gravitational potential energy, thermal energy (which is really just kinetic energy). Radiation is energy, matter is a form of energy. There is energy in electron configurations, which is chemical energy, and in nuclear configurations, which is nuclear energy. Most of all, there is energy in a cup of nice black coffee. At least that's where mine comes from.