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So many –
Ham On Rye or The Rooming House Madrigals by Charles Bukowski
Of Walking in Ice by Werner Herzog
Road To Los Angeles by John Fante
Journey To The End Of the Night by LF Celine
Crazy Horse by Mari Sandoz
His Dark Materials Trilogy by Phillip Pullman
Papillon by Henri Charrière
Hunger by Knut Hamsun
Cukoos’ Nest by Ken Keesey
 
The Citizenship Papers by Wendell Barry. Profound reading.

Stiff by Mary Roach. Cadavers do indeed have fascinating stories.

The Elegant Universe by Brian Greene. Blows my mind.

Cosmos by Carl Sagan. A classic of epic proportions.

Walden by Henry David Thoreau. Wonderful, impassioned.

Complications by Atul Gawande, MD. I'm a future doctor, but I bet everyone could benefit from reading this well-written book.

The Social Transformation of American Medicine by Paul Starr. The definitive work on the subject, and very germane to today's health care troubles.

The Last Intellectuals by Russell Jacoby. Intensely fascinating.
 
fiction:
most books by
Dean Koontz
Steven King
Tess Gerritsen (mostly murder mysteries/medical thrillers but all good)
Mary Higgins Clarke (more murder mysteries)
Robin Cook (his medical thrillers, not the others)
John Grisham
Mo Hayder

non fiction:
that's a bit more difficult because I don't know what your interests are. I've got a whole library of books, but unless you're into gardening many of them probably won't be of interest!

all books by Bill Bryson (make you laugh)
The Earth is But One Country (makes you think)
want to learn a language? - I can recommend some books
 
here are some of my favourites:

the hitchiker's guide to the galaxy (a trilogy of five) - douglas adams
the master and margarita- mikhail bulgakov
the tartar steppe - dino buzzati
guns, germs and steel - jared diamond
one hundred years of solitude - gabriel garcia marquez
perfume - patrick suskind
the name of the rose - umberto eco
the lord of the ring - JRR tolkien
the old man who read love stories - luis sepulveda
one flew over the cuckoo's nest - ken kesey


and here is a thread full of more options:
https://forums.macrumors.com/threads/62821/
 
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