[NicknamedBob]

"He retired from his math career at about 60 and then began his philosophy career, and it was quite a productive career."

I guess you could say I "changed careers" about that stage myself. I too have waxed philosophical, but I express myself in poems.

I don't have any of his works in my private library. I'll have to visit the public one.

I can't afford to buy all the books I want, so I write some of them.

[RightWhale]

One thing I learned in Metaphysics class: a book is not properly read unless its margins are thoroughly written in. The prof used to walk up and down the aisles checking our textbooks to see if we had been valiantly underlining and scribbling. He was the youngest in the room, BTW.

Can't do this with library books. So Amazon is my library now. Besides, they have a bigger selection than even the university library. Now that I am retired and have eliminated most expenditures, I find that I can afford way more books than I can read no matter how I let my specialized selection evolve.