The sci­en­tific method was per­fect­ed in the cru­cible of nat­u­ral sci­ence, and physics in par­tic­u­lar. And an old pro­fes­sor of mine once told me that a good the­o­ret­i­cal physi­cist is intrin­si­cal­ly a lazy per­son. And so the­se heuris­tics of ignor­ing super­flu­ous detail, sim­pli­fy­ing the prob­lem to its barest essen­tials, may­be even mak­ing a car­i­ca­ture out of it, solv­ing that sim­pler prob­lem. If you can’t solve that sim­pler prob­lem, solve an even sim­pler prob­lem. This actu­al­ly works in physics. Because the uni­verse is intrin­si­cal­ly a lazy place.