A short tale of the discoveries of different kinds of energies, their interconvertibility, conservation laws, and entropy. Nice clear explanation, but does not include references. Cool characters are: Galileo (mechanical energy, rolling balls and pendulums), Count Rumford (heat), John Dalton (atoms), Julius Robert Mayer (conservation of energy, energy on earth deriving from the sun), James Joule (experiments in interconversion of types of energy), Herman Helmholtz (conservation of energy), Nicholas Carnot (entropy), Antoine Henri Becquerel (radioactivity), Ernest Rutherford (model of the atom), Arthur Stanley Edington and Henry Norris Russel (composition of the sun), Hans Albrecht Bethe (nuclear fusion), Otto Hahn and Enrico Fermi (nuclear fission). ( )