"In... 1928... Dirac... a twenty-five-year-old recent convert from electrical engineering to theoretical physics, produced... the [remarkable] Dirac equation. ...He wanted to ...describe the behaviour of electrons more accurately ...[Previous] equations had either incorporated special relativity or quantum mechanics, but not both. ...Unlike other physicists, and ...Newton and Maxwell, Dirac did not proceed from a minute study of experimental facts. ...By 'playing with equations' he hit upon...[the] uniquely simple, elegant ...Dirac equation ...[which] predicts ...electrons are ...spinning and ...act as ...bar magnets, and [predicts] the rate of the spin and ... strength of ...magnetism."