Eureka! was a neat book. It features "mini-chapters' of three or four pages that summarize various concepts in philosophy, science, math, physics, psychology and economics. I have been reading a chapter a night for months but finally grew impatient and finished the book in one fell swoop today. I still don't claim to understand the theory of relativity. But it has been enjoyable to think about some things I have not contemplated in a long time, like Zeno's Paradox, the Cretan Liar's Paradox, Occam's Razor, etc. It's good to push yourself in a different direction from time to time.