World War Z: An Oral History of the Zombie War by Max Brooks
The Physics of Superheroes by James Kakalios
Big Bang: The Origin of the Universe by Simon Singh
The Code Book: The Science of Secrecy from Ancient Egypt to Quantum Cryptography by Simon Singh
I remember the Code Book. It was a good easy read, as I recall. The bit on quantum cryptography wasn’t quite up to scratch as I recall, and it’s pretty out of date now, but hey.