I am a professor of theoretical physics and an author of several books for the general public and three textbooks, on quantum field theory, on Einstein gravity, and on group theory for physicists.
|An Old Man's Toy
Einstein Gravity in a Nutshell was published in 2013 by Princeton University Press.
Group Theory in a Nutshell for Physicists was published in 2016 by Princeton University Press
As much fun as possible! (This could be a nice motto.)
It is often deeper to know why something is true rather than to have a proof that it is true.
On Gravity, my first popular book in almost twenty years