In "The Big Bang Theory" episode "The Terminator Decoupling", what book is Leonard reading on the train?

Wrinkles In Time

I happened to re-watch this one last night (we're going through last season's box set) and noticed what Leonard's book was. It's called Wrinkles in Time (not to be confused with Madeleine L'Engle's YA classic A Wrinkle in Time) and it's written by Nobel laureate George Smoot, who appears at the end of the episode and refuses to read Sheldon's paper.

http://raked.wordpress.com/2009/03/10/its-hot-in-here-must-be-summer/

George Fitzgerald Smoot III (born February 20, 1945) is an American astrophysicist, cosmologist, Nobel laureate, and $1 million TV quiz show prize winner (Are You Smarter Than a 5th Grader?).

https://en.wikipedia.org/wiki/George_Smoot