Had to Leave This Book at Home

The Martian.

I'm about 30 pages into it and, in my earlier days, I would have stayed up into the wee hours to finish it.*
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* I've done that before. When I was in college, on a quiet Friday night, I was browsing the stacks of the library. I checked out a 19th Century edition of The Three Musketeers and took it back to my dorm room. I thought I'd read a chapter or two before going to sleep.

Next think I knew, I had finished the book and it was 0530.