In comments over at Bobbi's, reader Matthew noted, in reference to Vinge's Fire Upon The Deep:Why Does E=mc²?: (And Why Should We Care?), and found myself setting the book down once every twenty pages or so to say "Derp. Why hadn't I seen that? It's so obvious now."
I cannot recommend this book highly enough if, like me, you loves you some physics but spent more time in math class writing short stories and doodling spaceships than taking notes.