The quantities on the two side of each of the equations in the book, are from science, or from life. The equations result from scientific experiments or from pure theory. Planck's equation signaled the start of atomic physics, and Einstein's E=m c^2 , the continuation. Dirac's equation reveals the secrets of the electron. All the equations predict physical reality; and yet they are strikingly simple to state, perhaps not to fully understand.-- They *are* beautiful! . Really! They are also fundamental discoveries that affect us all. Schrodinger's equation [along with the equivalt formulation of Heisenberg] puts quantum theory on a solid footing, and started wave mechanics. Shannon's equations initiated the age of information technology. And there are more: relativity, astronomy, dynamics, chemestry... The book consists of chapters written by authorities in the field, Roger Penrose, Steven Weinberg..., but no [or at least very little] knowledge of science is assumed on the part of the reader. Highly recommended!