If you like science and want a good read for your vacation, I would recommend We Have No Idea by Jorge Cham and Daniel Whiteson published by Riverhead Books. Jorge is the creator of the excellent PhD Comics (http://phdcomics.com/). His art and sense of humor lightens this ambitious guide to the unknown universe, covering the darkest mysteries of our universe. The authors make it easy to anyone – event if you do not have a PhD – to understand that we really don’t know much and makes you feel good about it highlighting the endless opportunities to discover and learn! To follow Jorge and Daniel, you will only need a good dose of curiosity and be receptive to geeky humor 😉