Interesting Books

General
"Guns Germs and Steel" by Jared Diamond.
"On Intelligence" by Jeff Hawkins.
"The Black Swan" by Nassim Nicholas Taleb.
"The Art of Thinking Clearly" by Rolf Dobelli.
"The Code Book" by Simon Singh.

Cosmology
"The Hidden Reality" by Brian Greene.
"The Cosmic Landscape" by Leonard Susskind.
"A Universe from Nothing" by Lawrence M. Krauss.

History
Any 20th century European history book written by Antony Beevor.
"In the Wake of the Plague" by Norman F. Cantor.

Spirituality
"The end of Faith" by Sam Harris.
"The God Delusion" by Richard Dawkins.
"God is Not Great" by Christopher Hitchens.
"Breaking the Spell" by Daniel C. Dennett.
"Six Impossible Things Before Breakfast" by Lewis Wolpert.
"The Buddha Speaks" edited by Anne Bancroft.

Novels
"The Name of the Rose" by Umberto Eco.
"Shantaram" by Gregory David Roberts.
"Cryptonomicon" by Neal Stephenson.
"If not Now, When?" by Primo Levi.
Avoid: "Gravity's Rainbow" by Thomas Pynchon. It is rubbish.