SkyMarshal

I'm sure there's something better than Sophie's World for that, I just don't know what it is.

Sophie's World is a fun novel and a map of the historical development of philosophy.

A People's History of the United States

Taiko, is equally good.

or his three volume set.

Either his single Introduction to Quantitative Finance

The first book on philosophy that both blew my hair back and made me realize philosophy is alot more than just academic was You Can Trust the Communists (to be Communists).