answer:I know of no deeper and more complete explanation of Gödel’s theorem than Gödel, Escher, Bach: An Eternal Golden Braid by Douglas Hofstadter. Although it’s Pulitzer Prize-winning clarity and wit are incomparable, it’s a bit long for just a casual perusal—but worth the time invested. The same author’s more recent I Am a Strange Loop also gives a good account of Gödel’s work in a shorter space. Five Equations that Changed the World by Michael Guillen is a nicely written volume that includes Einstein’s famous formula among its title subject. In fact just about any popularization of relativity (there are many) gives a suitable explanation.